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2（b+d)+10d
10p/2-3p
人气：498 ℃　时间：2020-02-06 02:46:46
解答
2（b+d)+10d
=2b+2d+10d
=2b+(2d+10d)
=2b+12d
10p/2-3p
=5p-3p
=2p
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