305X52的简便怎么做?
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305X52的简便怎么做?
305X52的简便怎么做?
305X52的简便怎么做?
305x52=61x5x4x13=20x61x13=1260x13=1260x10+1260x3=12600+3780=16380
305x52=61x5x52=61x260=15860
=300X52+5X52=15600+260=15860