先化简再求值 4x^5y³÷{x^4y³÷[x³y÷（x³y²÷2xy

先化简再求值 4x^5y³÷{x^4y³÷[x³y÷（x³y²÷2xy 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 1.化简求值：(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy 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 计算 [12(x+y)³(y-x)]³÷[4(x+y)²（x-y)]² 先化简,再求值：（3x²y-2）×y-（9x的4次方y³-15x²y²）÷（3x [x（x²y²-xy）-y（x²-x³y）]÷3x²y 【x(x²y²-xy)-y(x²-x³y)】÷3x²y 因式分解：[x（x²y²-xy）-y（x²-x³y）]÷3x²y 化简求值.（x-2y分之4xy 再加+x)除以4x³-x²y分之x²+4xy+4y 先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y