12x-3y=?如题 1 12x-3y=?2 2x+y)-(x+2y)=?
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12x-3y=?如题112x-3y=?22x+y)-(x+2y)=?12x-3y=?如题112x-3y=?22x+y)-(x+2y)=?12x-3y=?如题112x-3y=?22x+y)-(x+2y)
12x-3y=?如题 1 12x-3y=?2 2x+y)-(x+2y)=?
12x-3y=?如题
1 12x-3y=?2 2x+y)-(x+2y)=?
12x-3y=?如题 1 12x-3y=?2 2x+y)-(x+2y)=?
1)12x-3y =3(4x-y) =3(2x+y)(2x-y) 2) ( 2x+y)-(x+2y) =(2x+y+x+2y)(2x+y-x-2y) =(3x+3y)(x-y) =3(x+y)(x-y)
1、12x-3y=3[(2x)-y]=3(2x+y)(2x-y) 1、(2x+y)-(x+2y)=(2x+y+x+2y)(2x+y-x-2y)=(3x+3y)(x-y)=3(x+y)(x-y)
12x-3y=?如题 1 12x-3y=?2 2x+y)-(x+2y)=?
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