3X+2y=5x 2(3x+2y)=11x+7,去括号后要不要把同X,y移向?
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3X+2y=5x 2(3x+2y)=11x+7,去括号后要不要把同X,y移向?
对于此题还是分开算好点
3x+2y=5x2(3x+2y)然后再算3X+2y=11x+7
最后综合
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
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
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)/(x+y)=3求( 3x-2y-1)/(x+y-5)
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
(x+y)(2x-3y)=?
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2