1.1\2x^+2xy+2y^2.8a-4a^-43.1-m^-n^+2mn提示：2\1是二分之一的意思,^是平方的意思.

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$1.1\2x^+2xy+2y^2.8a-4a^-43.1-m^-n^+2mn提示：2\1是二分之一的意思,^是平方的意思.$

1.1\2x^+2xy+2y^2.8a-4a^-43.1-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^
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^2.8a-4a^-43.1-m^-n^+2mn提示：2\1是二分之一的意思,^是平方的意思.
1. 1/2x^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)

因式分解（x+y-2xy)(x+y-2)+(xy-1)^2设x+y=a,xy=b, x^2-xy/xy-y^2约分（x^2+xy/x-y)/（xy/x-y)计算 (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) .(x+y-2)(x+y-2xy)+(xy-1)^2 (x^2-xy)y÷y-x/xy怎么做? 2x²y-3(2xy-xy)-xy 已知a=x^+xy+y^ b=-3xy-x^求2A-3B (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) （y/(x^2-xy)+x/(y^2-xy))除以(x-y)/(xy) 已知x+y=a,xy=b,求x+y^2,x^2-xy+y^2 a/x-y,b/3y-3x,c/x^2-2xy+y^2通分已知x+y=a,x-y=b.求:x^2+y^2;xy 已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B 两个数学计算.a/b-(a-b)/b=x^2+xy/（x-y）÷xy/（x-y） (xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²）