5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]

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5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
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5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]

5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]

-a+10b-6c具体一点5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)] =5a+3b-[6c-2a-(a-c)]-9a+(7b+c) =5a+3b-6c+2a+(a-c)-9a+7b+c =5a+3b-6c+2a+a-c-9a+7b+c =(5+2+1-9)a+(3+7)b+(-6-1+1)c =-a+10b-6c 够详细了吧 亲 这是小学六年级的题...

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-a+10b-6c

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