（x^2y)^5/(x^2y)^2等于?

化简2x-(x-y)-y等于 3x-2y等于75 3y-2x等于5 x=?Y=? 2x+y等于8 y+5x等于21 求x和y （x^2y)^5/(x^2y)^2等于? 2x+y=4 x+2y=5 x+y等于?2x+y=4x+2y=5x+y等于? (3x-5y)-(3x-2y)等于几 （4x-3y)(5x+2y)-2x(9x-5y) 等于多少 y/2x-y+2x/y-2等于多少 [(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4X等于好多 2x+y+4y等于多少 2x*4y等于? (X+Y)^2等于几 (y/x+x/y+2)除以（y/x+x/y-2)等于多少 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 (x-y)的四次方(x-y)-2(x-y)²(y-x）³等于? 2(x+y)(x-y)-(x+y)²-(x-y)² 等于多少 2x-5y/x-y等于3/2,x/y得多少? x-y/3=x+y/2 2x-5y=7等于多少