1.1\2x^+2xy+2y^

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1.1\2x^+2xy+2y^
2.8a-4a^-4
3.1-m^-n^+2mn
提示：2\1是二分之一的意思,^是平方的意思.

$1.1\2x^+2xy+2y^$

1. 1/2x^2+2xy+2y^2 =2(1/4x^2+xy+y^2) =2(1/2x+y)^2 2. 8a-4a^2-4 =-(-8a+4a^2+4) =-4(-2a+a^2+1) =-4(a-1)^2 3. 1-m^2-n^2+2mn =1-(m^2+n^2-2mn) =1-(m-n)^2 =-[(m-n)^2-1] =-[(m-n)-1][(m-n)+1] =-(m-n-1)(m-n+1)

（xy-x^2)乘以(xy)/(x-y) （x^2+xy/x-y)/（xy/x-y)计算 (x+y-2xy)(x+y-2)+(1-xy)² (x^2-xy)y÷y-x/xy怎么做? (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) x-y/x²÷x²-2xy+y²/xy*（xy-x²）作乘法:(x+y)(x^2-xy+y^2)；(x-y)(x^2+xy+y^2) x^2-xy-6y^2+3xy+y+2 计算（xy-y^2)÷x-y/xy 因式分解：x×x-xy-2y×y-x-y 因式分解xy+y平方+x-y-2 x^2y+4xy+4y