计算2(2x-y)-3(2x+y)-8(2x-y)+8(2x+y)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
(x+y)^2-(3x-2y)^2计算
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
计算:(x-y)m(y-x)2m+(y-x)3m.
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)
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算:(2x+3y)(-2x-3y)+(3x+2y)(-3x+2y)