(x+2y)(2x-y)2(x+y)3的展开式中,各项系数之和,

x(x-y)2-(y-x)3 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算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 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 [(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答 (y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x) 化简y(x+y)+(x+y)(x-y)-x^2 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) (x+3y)的平方+2(x-y)(x+y)+(x-3y)的平方 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方 y=3(x-y),x=2(x-y)求x,y的值 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方