9(x-y)2-12(y2-x2)+4(x+y)2 因式分解
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9(x-y)2-12(y2-x2)+4(x+y)2因式分解9(x-y)2-12(y2-x2)+4(x+y)2因式分解9(x-y)2-12(y2-x2)+4(x+y)2因式分解9(x-y)^2-12(y
9(x-y)2-12(y2-x2)+4(x+y)2 因式分解
9(x-y)2-12(y2-x2)+4(x+y)2 因式分解
9(x-y)2-12(y2-x2)+4(x+y)2 因式分解
9(x-y)^2-12(y^2-x^2)+4(x+y)^2
=9x^2-18xy+9y^2-12y^2+12x^2+4x^2+8xy+4y^2
=25x^2-10xy+y^2
=(5x-y)^2
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/(x2+2xy-3y2)
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
(x2-4y2)-(x+2y)因式分解
9(x-y)2-12(y2-x2)+4(x+y)2 因式分解
4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy
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x2+y2+x+y=18 x2+y2-2x-4x=24 解方程组
因式分解:3x2+5xy-2y2+x+9y-4 x2+x-(a2-a) 3x2+4xy-y2 x,y,a后面的2表示平方
分解因式:4x2-12xy+9y2-2x+3y-6
试判断下列圆与圆的位置关系.(1)圆C1 :x2+y2+6x-4y+9=0和圆C2 :x2+y2-6x-12y-19=0(2)圆C1 :x2+y2-6x+4y+12=0和圆C2 :x2+y2-14x-2y+14=0
x+2y+4y2/x-2y+4x2y/4y2-x2,4y2 4x2 4y2-x2的2是平方
因式分解 2x2+xy-y2-4x+5y-6 x2-y2+a2-b2+2ax+2by 3x2+5xy-2y2+x+9y-4 b4-2b2-82x2+xy-y2-4x+5y-6x2-y2+a2-b2+2ax+2by3x2+5xy-2y2+x+9y-4b4-2b2-8
解下列方程组(1)x2/4-y2=1,x-y-2=0:(2)(x-3)2+y2=9,x+2y=0 (3)x2+y2=4,x2-y2=2
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x2+y2=1和x2+y2-4x+2y=4解这组方程,
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已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2=