计算:-3x+(x-1)-(3x-3)= 2(a-2)-3(a+1)= -(5a-4b)+2(a-2b)=-3x+(x-1)-(3x-3)= 2(a-2)-3(a+1)=-(5a-4b)+2(a-2b)=

问题描述:

计算:-3x+(x-1)-(3x-3)= 2(a-2)-3(a+1)= -(5a-4b)+2(a-2b)=
-3x+(x-1)-(3x-3)=
2(a-2)-3(a+1)=
-(5a-4b)+2(a-2b)=

-5x+2,-a-7,-3a,去括号时注意变号

-3x+(x-1)-(3x-3)
=-3x+x-1-3x+3
=-5x+2
2(a-2)-3(a+1)
=2a-4-3a-3
=-a-7
-(5a-4b)+2(a-2b)
=-5a+4b+2a-4b
=-3a