5a+2b+(3a-2b) -3x-(x+1)+(4x+2) -2/1(x+y)+3/1(x-y)5a+2b+(3a-2b)-3x-(x+1)+(4x+2)-2/1(x+y)+3/1(x-y)x-3/2(3x+9)要答案加方法
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5a+2b+(3a-2b) -3x-(x+1)+(4x+2) -2/1(x+y)+3/1(x-y)5a+2b+(3a-2b)-3x-(x+1)+(4x+2)-2/1(x+y)+3/1(x-y)x-3/2(3x+9)要答案加方法
5a+2b+(3a-2b) -3x-(x+1)+(4x+2) -2/1(x+y)+3/1(x-y)
5a+2b+(3a-2b)
-3x-(x+1)+(4x+2)
-2/1(x+y)+3/1(x-y)
x-3/2(3x+9)
要答案加方法
5a+2b+(3a-2b) -3x-(x+1)+(4x+2) -2/1(x+y)+3/1(x-y)5a+2b+(3a-2b)-3x-(x+1)+(4x+2)-2/1(x+y)+3/1(x-y)x-3/2(3x+9)要答案加方法
1.5a+2b+(3a-2b)=5a+2b+3a-2b=8a
2.-3x-(x+1)+(4x+2)=-3x-x-1+4x+2=1
3.-2/1(x+y)+3/1(x-y)=-2/1x-2/1y+3/1x-3/1y=-6/1x-6/5y
4.x-3/2(3x+9)=x-2x-6=-x-6
方法就是括号前若是+号、则直接去掉就行了、若是-号、则括号内全部变号.
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