24.9(x-y)2+12(x2-y2)+4(x+y)2因式分解为 [ ]A.(5x-y)2 B.(5x+y)2 C.(3x-2y)(3x+2y) D.(5x-2y)2
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计算(2x+3y)(2x-3y)(9y2+4x2)-(4x2-9y2)2
若x,y为实数,且(x2+y2)(x2+y2-1)=12,则x2+y2的值是——
因式分解:x2-9a2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y48a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12
因式分解:3X2十5xy-2y2+x+9y-4
4.因式分解x2(x-y)+y2(y-x)=(x+y)(x-y)^2
24.9(x-y)2+12(x2-y2)+4(x+y)2因式分解为 [ ]A.(5x-y)2 B.(5x+y)2 C.(3x-2y)(3x+2y) D.(5x-2y)2
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/(x2+2xy-3y2)
已知x,y满足(x-1)2+y2=16则x2+y2 的最小值为
化简x2+2x+1分之x2-y2÷x+1分之x-y
解方程组 {3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方 还有{2x-3y=12x2-3xy+y2-4x+3y-3=0
x2+y2+x+y=18 x2+y2-2x-4x=24 解方程组
快的100分!先合并同类项,再求值先合并同类项,再求值;(1)4x2—4x+1-9x2+12x-4,其中x=-1;(2)9x2-12xy+4y2-4x2+12xy-9y2,其中x=-1/2,y=1/2
因式分解 x2+4xy+4y2-2x-4y-35
因式分解;x2+4xy+4y2-2x-4y-35
x2+x+y2-y-2xy=?
圆C1:x2+y2-12x-2y-13=0和圆C2:x2+y2+12x+16y-25=0的公共弦长
求圆x2+y2-4=0与圆x2+y2-4x+4y-12=0的公共弦长
已知x/y=2/7,则x2-3xy+2y2/2x2-3xy+7y2的值是多少?