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无论m为何实数,二次函数y=x&
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y=4所以,y的值和m无任何关系如果你的二次函数是y=x^2-(m-3)x+m的话y=x^2-(m-3)x+m=x^2-mx+3x+m=x^2+3x-m(x-1)=(x-1)(x+4)-m(x-1)+4=(x-1)(x-m+4)+4即当x=1时,无论m为何实数,二次函数的图像总过点(1
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三克油~~。
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京ICP备号-1 京公网安备02号如图直线y=kx-k+2与抛物线y=1、4x²-1、2x+5、4交于A，B两点抛物线的对称轴于x轴交与点_百度知道
如图直线y=kx-k+2与抛物线y=1、4x²-1、2x+5、4交于A，B两点抛物线的对称轴于x轴交与点
4交于A如图直线y=kx-k+2与抛物线y=1;#178;-1、2x+5、4x&amp
提问者采纳
y2）的坐标符合方程组，B（3，1
=0，x1x2=4k-3：交点A（x1，y1+y2
-k+2=k（2k+1）-k+2=2k2+2;1&#8722：∵y=kx-k+2=k（x-1）+2;1
，∴存在定直线与以AB为直径的圆相切，（y1-y2）2=k2（x1-x2）2=k2（16k2+16）、B（x2，此直线即x轴;k+2
x2&#8722，2），解得，∴AB=(&#8722，AQ=BQ：当k=0时，∴AB的中点;x2)2+(y1&#+2）;1)2+(2&#8722，故：y＝kx&#8722；（3）解;2)2
=4，∴Q（1，∵圆心到x轴的距离刚好等于半径;0)2
，∴AB=(x1&#8722，y1）、B（x2，直线y=kx-k+2过定点P（1，解析式是y=0．理由如下，BQ=(3&#8722：存在定直线与以AB为直径的圆相切，2）;1&#8722：x1＝&#8722，x1+x2
=2k+1，∵抛物线的对称轴与x轴交于点Q，所以，即以AB为直径的圆的圆心坐标为（2k+1，∴AB2=AQ2+BQ2，消掉y得，y1），此直线即x轴，∴当x-1=0，0），∵AB的中点是（x1+x2
），即x=1时，x2＝3
，直线y=kx-k+2=2，2），∵x1+x2=2+4k;1)2+(2&#
=(16k2+16)+k2(16k2+16)
=4k2+4，∴以AB为直径的圆的半径为2k2+2，抛物线y=1
（x-1）2+1：y＝2
x2&#8722解答，交点A（x1，AQ=(&#8722，y2）的坐标符合方程组：（1）证明，∴（x1-x2）2=（x1+x2）2-4x1x2=（2+4k）2-4（4k-3）=16k2+16;1
；（2）证明，△AQB是等腰直角三角形;3)2+(2&#8722，即A（-1，y=2
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出门在外也不愁关于x的一元二次方程x²-（2k+1）x+1=0有两个相等的实数根,那么k的值是?_百度作业帮
关于x的一元二次方程x²-（2k+1）x+1=0有两个相等的实数根,那么k的值是?
加菲41日271
Δ=(2k+1)²-4k²=4k²+1+4k-4k²=4k+1=0;∴k=-1/4
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出现乱码了嗯嗯关于x的一元二次方程x&#178;-（2k+1）x+1=0有两个相等的实数根，那么k的值是？x=[-b±√(b&#178;-4ac)]/2a在这里就是x=[（2k+1）±√(-（2k+1）&#178;-4)]/2&&有两个相等的实数根就是说&要通过Δ=b2-4ac的根的判别式来判断一元二次方程有几个根</...
关于x的一元二次方程x&#178;-（2k+1）x+1=0有两个相等的实数根，那么k的值是？
x=[-b±√(b&#178;-4ac)]/2a在这里就是x=[（2k+1）±√(-（2k+1）&#178;-4)]/2&&有两个相等的实数根就是说&要通过Δ=b2-4ac的根的判别式来判断一元二次方程有几个根1.当Δ=b2-4ac&0时&x无实数根（初中）2.当Δ=b2-4ac=0时&x有两个相同的实数根&即x1=x23.当Δ=b2-4ac&0时&x有两个不相同的实数根2.当Δ=b2-4ac=0时&x有两个相同的&实数根&&即x1=x2（2k+1）&#178;-4=0&&&&k=0.5孩子&你可以百度一元二次方程&这里面总结很全的&&不像教科书那么枯燥包括他的起源历史&&你会对你学的知识感到惊奇&&也会赞叹发明他的人有多么伟大&&人家抱着孩子喂着奶就发明了这个&你安安静静怎么想也想不明白的数学题
扫描下载二维码The following ASCII table contains both ASCII control characters, ASCII printable characters and the extended ASCII character set ISO 8859-1, also called ISO Latin1
ASCII Code
ASCII Code - The extended ASCII table
ASCII stands for American Standard Code for Information Interchange. It's a 7-bit character code where every single bit represents a unique character. On this webpage you will find 8 bits, 256 characters, according to ISO 8859-1 and Microsoft(R) Windows Latin-1 increased characters, which is available in certain programs such as Microsoft Word.
ASCII control characters (character code 0-31)
The first 32 characters in the ASCII-table are unprintable control codes and are used to control peripherals such as printers.
000000NUL&#000;&Null char
100101SOH&#001;&Start of Heading
200202STX&#002;&Start of Text
300303ETX&#003;&End of Text
400404EOT&#004;&End of Transmission
500505ENQ&#005;&Enquiry
600606ACK&#006;&Acknowledgment
700707BEL&#007;&Bell
801008 BS&#008;&Back Space
901109 HT&#009;&Horizontal Tab
100120A LF&#010;&Line Feed
110130B VT&#011;&Vertical Tab
120140C FF&#012;&Form Feed
130150D CR&#013;&Carriage Return
140160E SO&#014;&Shift Out / X-On
150170F SI&#015;&Shift In / X-Off
1602010DLE&#016;&Data Line Escape
1702111DC1&#017;&Device Control 1 (oft. XON)
1802212DC2&#018;&Device Control 2
1902313DC3&#019;&Device Control 3 (oft. XOFF)
2002414DC4&#020;&Device Control 4
2102515NAK&#021;&Negative Acknowledgement
2202616SYN&#022;&Synchronous Idle
2302717ETB&#023;&End of Transmit Block
2403018CAN&#024;&Cancel
2503119 EM&#025;&End of Medium
260321ASUB&#026;&Substitute
270331BESC&#027;&Escape
280341C FS&#028;&File Separator
290351D GS&#029;&Group Separator
300361E RS&#030;&Record Separator
310371F US&#031;&Unit Separator
ASCII printable characters (character code 32-127)
Codes 32-127 are common for all the different variations of the ASCII table, they are called printable characters, represent letters, digits, punctuation marks, and a few miscellaneous symbols. You will find almost every character on your keyboard. Character 127 represents the command DEL.
3204020&&#32;&Space
3304121!&#33;&Exclamation mark
3404222"&#34;&Double quotes (or speech marks)
3504323#&#35;&Number
3604424$&#36;&Dollar
3704525%&#37;&Procenttecken
3804626&&#38;&Ampersand
3904727'&#39;&Single quote
4005028(&#40;&Open parenthesis (or open bracket)
4105129)&#41;&Close parenthesis (or close bracket)
420522A*&#42;&Asterisk
430532B+&#43;&Plus
440542C,&#44;&Comma
450552D-&#45;&Hyphen
460562E.&#46;&Period, dot or full stop
470572F/&#47;&Slash or divide
48060300&#48;&Zero
49061311&#49;&One
50062322&#50;&Two
51063333&#51;&Three
52064344&#52;&Four
53065355&#53;&Five
54066366&#54;&Six
55067377&#55;&Seven
56070388&#56;&Eight
57071399&#57;&Nine
580723A:&#58;&Colon
590733B;&#59;&Semicolon
600743C<&#60;&Less than (or open angled bracket)
610753D=&#61;&Equals
620763E>&#62;&Greater than (or close angled bracket)
630773F?&#63;&Question mark
6410040@&#64;&At symbol
6510141A&#65;&Uppercase A
6610242B&#66;&Uppercase B
6710343C&#67;&Uppercase C
6810444D&#68;&Uppercase D
6910545E&#69;&Uppercase E
7010646F&#70;&Uppercase F
7110747G&#71;&Uppercase G
7211048H&#72;&Uppercase H
7311149I&#73;&Uppercase I
741124AJ&#74;&Uppercase J
751134BK&#75;&Uppercase K
761144CL&#76;&Uppercase L
771154DM&#77;&Uppercase M
781164EN&#78;&Uppercase N
791174FO&#79;&Uppercase O
8012050P&#80;&Uppercase P
8112151Q&#81;&Uppercase Q
8212252R&#82;&Uppercase R
8312353S&#83;&Uppercase S
8412454T&#84;&Uppercase T
8512555U&#85;&Uppercase U
8612656V&#86;&Uppercase V
8712757W&#87;&Uppercase W
8813058X&#88;&Uppercase X
8913159Y&#89;&Uppercase Y
901325AZ&#90;&Uppercase Z
911335B[&#91;&Opening bracket
921345C\&#92;&Backslash
931355D]&#93;&Closing bracket
941365E^&#94;&Caret - circumflex
951375F_&#95;&Underscore
9614060`&#96;&Grave accent
9714161a&#97;&Lowercase a
9814262b&#98;&Lowercase b
9914363c&#99;&Lowercase c
10014464d&#100;&Lowercase d
10114565e&#101;&Lowercase e
10214666f&#102;&Lowercase f
10314767g&#103;&Lowercase g
10415068h&#104;&Lowercase h
10515169i&#105;&Lowercase i
1061526Aj&#106;&Lowercase j
1071536Bk&#107;&Lowercase k
1081546Cl&#108;&Lowercase l
1091556Dm&#109;&Lowercase m
1101566En&#110;&Lowercase n
1111576Fo&#111;&Lowercase o
11216070p&#112;&Lowercase p
11316171q&#113;&Lowercase q
11416272r&#114;&Lowercase r
11516373s&#115;&Lowercase s
11616474t&#116;&Lowercase t
11716575u&#117;&Lowercase u
11816676v&#118;&Lowercase v
11916777w&#119;&Lowercase w
12017078x&#120;&Lowercase x
12117179y&#121;&Lowercase y
1221727Az&#122;&Lowercase z
1231737B{&#123;&Opening brace
1241747C|&#124;&Vertical bar
1251757D}&#125;&Closing brace
1261767E~&#126;&Equivalency sign - tilde
1271777F&#127;&Delete
The extended ASCII codes (character code 128-255)
There are several different variations of the 8-bit ASCII table. The table below is according to ISO 8859-1, also called ISO Latin-1. Codes 128-159 contain the Microsoft(R) Windows Latin-1 extended characters.
12820080&#128;&#128;&Euro sign
12920181&&&&
13020282&#130;&#130;&Single low-9 quotation mark
13120383&#131;&#131;&Latin small letter f with hook
13220484&#132;&#132;&Double low-9 quotation mark
13320585&#133;&#133;&Horizontal ellipsis
13420686&#134;&#134;&Dagger
13520787&#135;&#135;&DDouble dagger
13621088&#136;&#136;&Modifier letter circumflex accent
13721189&#137;&#137;&Per mille sign
1382128A&#138;&#138;&SLatin capital letter S with caron
1392138B&#139;&#139;&Single left-pointing angle quotation
1402148C&#140;&#140;&OELatin capital ligature OE
1412158D&&&&
1422168E&#142;&#142;&Latin captial letter Z with caron
1432178F&&&&
14422090&&&&
14522191&#145;&#145;&Left single quotation mark
14622292&#146;&#146;&Right single quotation mark
14722393&#147;&#147;&Left double quotation mark
14822494&#148;&#148;&Right double quotation mark
14922595&#149;&#149;&Bullet
15022696&#150;&#150;&En dash
15122797&#151;&#151;&Em dash
15223098&#152;&#152;&Small tilde
15323199&#153;&#153;&Trade mark sign
1542329A&#154;&#154;&Latin small letter S with caron
1552339B&#155;&#155;& Single right-pointing angle quotation mark
1562349C&#156;&#156;&Latin small ligature oe
1572359D&&&&
1582369E&#158;&#158;&Latin small letter z with caron
1592379F&#159;&#159;&YLatin capital letter Y with diaeresis
160240A0&&#160;&Non-breaking space
161241A1?&#161;&Inverted exclamation mark
162242A2?&#162;&Cent sign
163243A3?&#163;&Pound sign
164244A4¤&#164;&Currency sign
165245A5?&#165;&Yen sign
166246A6?&#166;&Pipe, Broken vertical bar
167247A7§&#167;&Section sign
168250A8¨&#168;&Spacing diaeresis - umlaut
169251A9(C)&#169;&Copyright sign
170252AA?&#170;&Feminine ordinal indicator
171253AB<<&#171;&Left double angle quotes
172254AC?&#172;&Not sign
173255AD-&#173;&Soft hyphen
174256AE(R)&#174;&Registered trade mark sign
175257AF?&#175;&Spacing macron - overline
176260B0°&#176;&Degree sign
177261B1±&#177;&Plus-or-minus sign
178262B2?&#178;&sup2;Superscript two - squared
179263B3?&#179;&sup3;Superscript three - cubed
180264B4?&#180;&Acute accent - spacing acute
181265B5u&#181;&Micro sign
182266B6?&#182;&Pilcrow sign - paragraph sign
183267B7·&#183;&Middle dot - Georgian comma
184270B8,&#184;&Spacing cedilla
185271B9?&#185;&sup1;Superscript one
186272BA?&#186;&Masculine ordinal indicator
187273BB>>&#187;&Right double angle quotes
188274BC 1/4 &#188;&frac14;Fraction one quarter
189275BD 1/2 &#189;&frac12;Fraction one half
190276BE 3/4 &#190;&frac34;Fraction three quarters
191277BF?&#191;&Inverted question mark
192300C0?&#192;&ALatin capital letter A with grave
193301C1?&#193;&ALatin capital letter A with acute
194302C2?&#194;&ALatin capital letter A with circumflex
195303C3?&#195;&ALatin capital letter A with tilde
196304C4?&#196;&ALatin capital letter A with diaeresis
197305C5?&#197;&ALatin capital letter A with ring above
198306C6AE&#198;&AELatin capital letter AE
199307C7?&#199;&CLatin capital letter C with cedilla
200310C8?&#200;&ELatin capital letter E with grave
201311C9?&#201;&ELatin capital letter E with acute
202312CA?&#202;&ELatin capital letter E with circumflex
203313CB?&#203;&ELatin capital letter E with diaeresis
204314CC?&#204;&ILatin capital letter I with grave
205315CD?&#205;&ILatin capital letter I with acute
206316CE?&#206;&ILatin capital letter I with circumflex
207317CF?&#207;&ILatin capital letter I with diaeresis
208320D0?&#208;&ETH;Latin capital letter ETH
209321D1?&#209;&NLatin capital letter N with tilde
210322D2?&#210;&OLatin capital letter O with grave
211323D3?&#211;&OLatin capital letter O with acute
212324D4?&#212;&OLatin capital letter O with circumflex
213325D5?&#213;&OLatin capital letter O with tilde
214326D6?&#214;&OLatin capital letter O with diaeresis
215327D7×&#215;&Multiplication sign
216330D8?&#216;&OLatin capital letter O with slash
217331D9?&#217;&ULatin capital letter U with grave
218332DA?&#218;&ULatin capital letter U with acute
219333DB?&#219;&ULatin capital letter U with circumflex
220334DC?&#220;&ULatin capital letter U with diaeresis
221335DD?&#221;&YLatin capital letter Y with acute
222336DE?&#222;&THORN;Latin capital letter THORN
223337DFss&#223;&Latin small letter sharp s - ess-zed
224340E0à&#224;&Latin small letter a with grave
225341E1á&#225;&Latin small letter a with acute
226342E2?&#226;&Latin small letter a with circumflex
227343E3?&#227;&Latin small letter a with tilde
228344E4?&#228;&Latin small letter a with diaeresis
229345E5?&#229;&Latin small letter a with ring above
230346E6ae&#230;&Latin small letter ae
231347E7?&#231;&Latin small letter c with cedilla
232350E8è&#232;&Latin small letter e with grave
233351E9é&#233;&Latin small letter e with acute
234352EAê&#234;&Latin small letter e with circumflex
235353EB?&#235;&Latin small letter e with diaeresis
236354ECì&#236;&Latin small letter i with grave
237355EDí&#237;&Latin small letter i with acute
238356EE?&#238;&Latin small letter i with circumflex
239357EF?&#239;&Latin small letter i with diaeresis
240360F0?&#240;&Latin small letter eth
241361F1?&#241;&Latin small letter n with tilde
242362F2ò&#242;&Latin small letter o with grave
243363F3ó&#243;&Latin small letter o with acute
244364F4?&#244;&Latin small letter o with circumflex
245365F5?&#245;&Latin small letter o with tilde
246366F6?&#246;&Latin small letter o with diaeresis
247367F7÷&#247;&Division sign
248370F8?&#248;&Latin small letter o with slash
249371F9ù&#249;&Latin small letter u with grave
250372FAú&#250;&Latin small letter u with acute
251373FB?&#251;&Latin small letter u with circumflex
252374FCü&#252;&Latin small letter u with diaeresis
253375FD?&#253;&Latin small letter y with acute
254376FE?&#254;&Latin small letter thorn
255377FF?&#255;&Latin small letter y with diaeresis}