2x+5y=12,2x+3y=6,x是什么,y是什么两个式子一定要相等
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x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
2(x-2y)²-7(x-2y)³+3(2y-x)²+(2y-x)³合并同类项 这个式子2(x-2y)²-7(x-2y)³+3(2y-x)²-(2y-x)³=2(x-2y)²-7(x-2y)³+3(x-2y)²+(x-2y)³=5(x-2y)²-6(x-2y)³=(x-2y)²(5-6x+12y)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
3x+5y-(x+y)=6 2(x+y)-3x=-7
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 (X+Y)^2 X^2Y+XY^2注:*/* 是分数
把6x(x-y)的平方+3(y-x)的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]
(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)=36 4(x+y)-5(x-y)=2
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51