化简x^-y^/x^-2xy+y^

化简x^-y^/x^-2xy+y^ x^2y-2xy+y化简 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y) 化简2(x²y+xy)-3(x²y-xy)-4x²y (-x-y)(x^2+xy+y^2) 2*(x-y)²(y-x)(xy) （x^2+xy/x-y)/（xy/x-y)计算 [(x-y)^2-(x+y)^2]/(-4xy) 化简 化简x-y/2xy-x²-y² 化简：[(x+y)²-(x-y)²]÷2xy 化简:[4xy(x-y)^-1 + (xy^-1 - x^-1y)/(x^-1 + y^-1)] / (x+y)^2 X-Y/2X+2Y XY/X+Y² 因式分解：x×x-xy-2y×y-x-y 化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy} 化简：(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy) 化简[x-y+4xy/(x-y)][x+y-4xy/(x-y)]