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数学
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当a=1,b=-3时,整式3a-{-2b+[a-(4a-3b)]}=?
人气:486 ℃ 时间:2020-04-09 07:52:38
解答
3a-{-2b+[a-(4a-3b)]}
=3a+2b-[a-(4a-3b)]
=3a+2b-a+4a-3b
=6a-b
=6×1-(-3)
=6+3
=9
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