计算:(x-4y)(2x+3y)-(x+2y)(x-y).
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
计算:(x-y)m(y-x)2m+(y-x)3m.
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算:(3x-y)2-(2x+y)2+5x(y-x)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(x+y)^2-(3x-2y)^2计算
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
计算 1.(-2x)^3-3x乘(x-2x^2) 2.【(x+2y)^2-(x-2y)(x+2y)】÷4y
计算:(X+Y)^5÷(-X-Y)^3*(X-Y)^2
用平方差计算(2x+3y)*(x-y)-(2x+y)*(2x-y)