求化简 y=(x-5)(100-7(x-7))快点嘛
(3x-4y)的平方-(4y-3x)的三次方 快点~~~
7x+[-3x-3(x-2y)]-[5x-(2x-y)]
已知5x=7y,x与y( )
解方程:(4x+7)÷(9x+7)=3/5快点要步骤
(x-y)7÷(y-x)4+(-x-y)8÷(x+y)5.
求化简 y=(x-5)(100-7(x-7))帮帮忙啦
求化简 y=(x-5)(100-7(x-7))
(x-4y)分之(3x)+(4y-x)分之(x+y)-(x-4y)分之(7y)
已知(2y-x)/(7x-5y),则x/y的值为( )
2x+5x+10(50-2x)=240怎么解方程快点
去括号并合并同类项(1)3x-2(x+7)+2(2x+5) (2)(4x-3y)-[-(3y-x)+(x-y)]-5x
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7