去括号,并合并同类项:(1)x+(2x-1)-(x/3+3) (2)-(b-4)+4(-b-3)

问题描述:

去括号,并合并同类项:(1)x+(2x-1)-(x/3+3) (2)-(b-4)+4(-b-3)

(1)x+(2x-1)-(x/3+3)=x+2x-1-x/3-3=3x-x/3-4=8x/3-4
(2)-(b-4)+4(-b-3)=-b+4-4b-3*4=-5b-8

(1)x+(2x-1)-(x/3+3)
=x+2x-1-x/3-3
=3x-x/3-4
=8x/3-4
(2)-(b-4)+4(-b-3)
=-b+4-4b-12
=-5b-8