y=x²+2(a-2)x+2a-4设函数图象与x轴交点的横坐标为x1 与 x2|x1/x2|为2/3,若a<2,求a的值.其实前半段我会的:∵a<2,x1x2=2a-4∴x1x2=2a-4<0所以x1/x2<0,x1/x2= - 2/3我会了:x1=-2/3x2 1/3x2=-2a+4x2=6a-6,-2/3x2
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/11 01:39:34
xT[OA+ӗFn.I#˯&&I%5"DS˥^ADD)J]=3H&cyX\\ G#kxe5g}͇>`7$ucnrnf\#+qeޛ'HhvGj _PajJ_`l&BSlɓ|l\鏆^[_/ݦ/{_i%Zmbpی5;IGωet6 &J<4DA?!α73`. > p|a!Ga!
8:Iq"J!)PG3+ertL-75BGVe:h]<=Uv}$IURD?_T_HYZBZxvMyV)uOܔTcXׅ^?;$Q9S_qXX*0fonwQݐE ԄРwfشD h 0E
<'&1bȒ? odRHܐKNWny ܄F;۫I&~7)uSZ#l<9s0P"S '$jdQ<[*9QTI<Mګù $c'%J· 1|YY\$ 3-BƘC,ċNMLy:-6q!TIg> >r_r
1(x-3x-1)(x+3y-1)2(3x-2y+1/4)²3(a+b)²-(a-b)²4 [2x²-(x+y)(x-y)][(-x-y)×(y-x)+2y²],其中x=1 y=25[(0.5x-y)²+(0.5x+y)²](0.5x²-2y²)6(a+3b)²-2(a+3b)(a-3b)+(a-3b)²7
利用乘法公式计算(x+y)(x²+y²)(x-y)(x的四次方+y四次方)(a-2b+3)(a+2b-3)[(x-y)²+(x+y)²](x²-y²)(m-n-3)²先化简,再求值[(a-1/2)²-(a+1/2)²](a+3),其中a=-2
若x²+4y²=(x+2y)²+A=(x-2y)²+B,则A= B=
已知抛物线y=x²-2x+a(a
已知抛物线y=x²-2x+a(a
1·已知a+b+c=0且a²+b²+c²=1,求ab+bc+ac的值.2·已知x,y满足等式x²+y²-4x+y+17/4=0,求(x+y)²的值.3·已知x+y=5,x²+y²=13,求代数式x²y+2x²y²+xy²的值.4·若a²+b²+
约分,急① X³-2X²Y/X²-2XY²②a²-(b-c)²/(a+b)²-c²
几道初二计算题1、2(x-1)²-(x+2)(x-2)2、[x(x²y²-xy)-y(x²-x³y)]÷3x²y3、分解因式 4a²-b²-2bc-c²4、已知x+y=6,xy=8,求x²+y²的值好久没做了
(x+y)²-4(x+y-1)(x²+y²)²-4x²y²(x²+2x)²+2(x²+2x)+1a²-b²-2a+19-6a-6b+a²+2ab+b²
y=√a²-x² 求导 是如何转化为a²-x²/2√a²-x²的
几道数学的约分题.(1)约分.2X²-2/X²-2X+1 3A²-12A+12/4-A² 2 若X²+Y²-2X-6Y+10=0 求分式 2XY-Y²-X²/Y²-X²
1.(b²+2a²)(2a²-b²) 2.(4x²-4y²)(x²+y²) 3.—(x-1)(x+1)-3(x+2)(x-2) 4.(5y²+4x²)[4y²+(2x-y)(-2x-y)]
1.(3x²+2x-8)²-(x²-2x-8)²2.(x+2)(x+3)+x²-43.x²(a-b)+16(b-a)4.(x²+2x)²-7(x²+2x)-85.(x²+9y²)²-36x²y²6.(x-1)(x-2y-1)+y²
1、(π-1)(a-1)+3(1-a)²2、½x²-8ax+32a²3、a²-(b²+c²-2bc)4、x²(x²-y²)+z²(y²-x²)5、(a+b)²+4(a+b+1)6、已知a²+b²+4a-2b+5=0,求a、b的
1.(x²-2x+1-y²)/(x+y-1)=2.a²+2ab+b²+(a-2)²=0,则b=( )
①.X²-2X+1/X²-1 ÷ X²-X/X+1②.a-1/a²-4a+4 ÷ a²-1/a²-4③.x³-x²/x²-x ÷ x²-2x/x-1④.(x-y)²/x+y ÷ 1/y+x X 1/x-y帮下忙嘛 咯
已知A=2x²-5xy+2y²+x-2y,B=x²-5/2xy+y²-2x+y,且A-2B=3a,|x-a|+(y-1)²=0
数学题 计算已知x²-4X+Y²-10Y+29=0 求 x³Y²+4x³y²+4x4次方y² x-1=根号三 求代数式(x+1)²-4(x+1)+44-12(x-y)+9(x-y)²(x+y)²-2x-2y+1-a+2a²-a³