如果a-b=5,那么3a+7+5b-6(a+1/3)=1/3后面有个b

Question

如果a-b=5,那么3a+7+5b-6(a+1/3)=
1/3后面有个b

Answer 1

3a+7+5b-6(a+1/3b)
=3a+7+5b-6a-2b
=-3a+3b+7
=-3(a-b)+7
=-3×5＋7
=-8