作业帮x+(-y+3) x-(-3-y) -(x-y)+3 3-(X+Y) 怎样去括号?快
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x+(-y+3) x-(-3-y) -(x-y)+3 3-(X+Y) 怎样去括号?快
x+(-y+3) x-(-3-y) -(x-y)+3 3-(X+Y) 怎样去括号?快
x+(-y+3) x-(-3-y) -(x-y)+3 3-(X+Y) 怎样去括号?快
x+(-y+3) x-(-3-y) -(x-y)+3 3-(X+Y)
=x-y+3 =x+3+y =-x+y+3 =3-x-y
x+(-y+3)=x-y+3
x-(-3-y)=x+3+y
-(x-y)+3=-x+y+3
3-(X+Y)=3-x-y
括号前是+则去括号不变号，是-则每一项都变为相反数。。
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