若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
【多项式相乘】:(3x-y)(y+3x)-(4x-3y)(4x+3y)
(x-4y)分之(3x)+(4y-x)分之(x+y)-(x-4y)分之(7y)
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
若3x=7y,则y分之x= ,x:(x:y)=
若3x=7y,则y比x= ,x:(x+y)=
已知x+y+2(-x-y+1)=3(1-y-x)-4(y+x-1),则x+y等于( )