如果a-b=5,那么3a+7+5b-6(a+1/3)=1/3后面有个b

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如果a-b=5,那么3a+7+5b-6(a+1/3)=1/3后面有个b如果a-b=5,那么3a+7+5b-6(a+1/3)=1/3后面有个b如果a-b=5,那么3a+7+5b-6(a+1/3)=1/3

如果a-b=5,那么3a+7+5b-6(a+1/3)=1/3后面有个b
如果a-b=5,那么3a+7+5b-6(a+1/3)=
1/3后面有个b

如果a-b=5,那么3a+7+5b-6(a+1/3)=1/3后面有个b
3a+7+5b-6(a+1/3b)
=3a+7+5b-6a-2b
=-3a+3b+7
=-3(a-b)+7
=-3×5+7
=-8

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

=3(5+b)=7+5b-6(5+b)-2b
=-8