(x-2)(x-3)+2(x+y)(x-5)-3(x²-7x+13),其中x=3又3分之1

[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 x(x-y)2-(y-x)3 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) 3^x+2x=y,x 因式分解3x^2(x-y)+6x(y-x) 因式分解x(x+y)(x-y)-x(x+y)^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) 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 省略乘号2x*y 3*x*x省略乘号2x*y,3*x*x 化简：3x（2x+y)-2x(x-y) x是字母x不是乘号 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²