化简 1/7（-2x+3y)(-2x-3y)-10(x+y)的平方

化简3(x-y)-7(x--y)+2(y-x) 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简 把(x-y)看作一个整体,化简:(1)5(x-y)+2(x-y)-4(x-y);(2)3(x-y²-4(x-y)+7（x-y)-6(x-y) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 化简 1/7（-2x+3y)(-2x-3y)-10(x+y)的平方 化简:5(x-y)+2(x+y)-3(x-y) 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 化简(X-2Y)-(Y-3X) 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 化简x^2-4x+4/2x-4 3x^2-9x-12/x^2+2x+1 x^2-7x+12/-x^2+9x-20 xy-x-y+1/y^2-2y+1(1)x^2-4x+4/2x-4(2) 3x^2-9x-12/x^2+2x+1 (3)x^2-7x+12/-x^2+9x-20 (4)xy-x-y+1/y^2-2y+1 计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e ,