3x-2y=15,3y-2x=11 x= y=
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2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
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
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+y)(2x-3y)=?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
3^x+2x=y,x
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x-y=3,求[(x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²
3x-2y=15,3y-2x=11 x= y=
3x-2y=15 3y-2x=11 求x+y
若3x-2y=15,3y-2x=11,求x+y
(x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11