12(x+y)^2+11(x^2-y^2)+2(x-y)^2 用十字相乘法

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12(x+y)^2+11(x^2-y^2)+2(x-y)^2 用十字相乘法
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12(x+y)^2+11(x^2-y^2)+2(x-y)^2 用十字相乘法
12(x+y)^2+11(x^2-y^2)+2(x-y)^2 用十字相乘法

12(x+y)^2+11(x^2-y^2)+2(x-y)^2 用十字相乘法
3 2
×
4 1
所以原式=[3(x+y)+2(x-y)][4(x+y)+(x-y)]
=(5x+y)(5x+3y)

原式=（3x+3y+2x-2y）（4x+4y-x+y）
=（5x+y)(3x+5y)
=15x²+28xy+5y².

设x+y=a x-y=b
原式等于 12a^2+11ab+2b^2 就可以用十字相乘了 等于（3a+2b）（4a+b）
后面就不用说了吧

求做因式分解12(x+y)^2+11(x+y)(x-y)+2(x-y)^2 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) (x-y)^2+12(x-y)+36 9(x-y)-12(y-x)^2 因式分解x(x+y)(x-y)-x(x+y)^2 [(x-y)^2-(x+2y)(x-2y)]/y 计算:y-x分之x+y+x-y分之y-y-x分之2x-y 因式分解(x+y)^2y^2-12(x+y)y^2+36y^2-y^4 x^2(x-y)+(y-x) x(x-y)2-(y-x)3 【(x-y)^2+(x+y)(x-y)】除以 2x [(x-y)²+(x+y)(x-y)]除以2x (x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值 （x-y)^2+7(x+y)-11(x-y)^2-8(X+Y)的计算过程 (X,Y) f(x,y)={12y^2,0