化简求值,4x^5y³÷[x^4y³÷[x³y÷（x³y²÷2xy&#

先化简再求值 4x^5y³÷{x^4y³÷[x³y÷（x³y²÷2xy 1.化简求值：(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy 化简求值.（x-2y分之4xy 再加+x)除以4x³-x²y分之x²+4xy+4y 化简求值:(1)已知x+y=6,xy=-2,求(x^4-y^4)÷(x^2+y^2/xy)÷(6x-6y); 化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x&# 先化简,再求值(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2*1/x+y,其中x=-4,y=1 化简求值：(x+y)(x-y)+(x-y)²-(6x²y-2xy²)÷2y,其中x=-2, 化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2 化简求值[1-(2x/x+y）]÷ （x²-2xy+y²/3x+3y）+（x²+xy/x& 先化简,再求值：[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5 化简求值【（x－2y）2－x(x－4y) －8xy】÷4y,其中x=-1.5,y=2 化简求值【（x－2y）2－x(x－4y) －8xy】÷4y,其中x=-1.5,y=2,