Y=3+2X,则2（Y-2X)^3-4(2X-Y)^2+6X-3Y=?
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Y=3+2X,则2（Y-2X)^3-4(2X-Y)^2+6X-3Y=?Y=3+2X,则2（Y-2X)^3-4(2X-Y)^2+6X-3Y=?Y=3+2X,则2（Y-2X)^3-4(2X-Y)^2+6X
Y=3+2X,则2（Y-2X)^3-4(2X-Y)^2+6X-3Y=?
Y=3+2X,则2（Y-2X)^3-4(2X-Y)^2+6X-3Y=?
Y=3+2X,则2（Y-2X)^3-4(2X-Y)^2+6X-3Y=?
用整体代换做 答案是9
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y
若x+y=4,则多项式1/2(x+y)+4(x-y)-3（x-y）-3/2(x+y)-x+y值是（）
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?