3个回答
展开全部
47×31+53×21
=(50-3)x31+(50+3)x21
=50x31-3x31+50x21+3x21
=50(31+21)-3(31-21)
=50x52-3x10
=2600-30=2570
=(50-3)x31+(50+3)x21
=50x31-3x31+50x21+3x21
=50(31+21)-3(31-21)
=50x52-3x10
=2600-30=2570
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展开全部
47x31+53x21
=(50-3)x31+(50+3)x21
=50x31-3x31+50x21+3x21
=50x(31+21)-3x(31-21)
=50x52-3x10
=2600-30
=2570
=(50-3)x31+(50+3)x21
=50x31-3x31+50x21+3x21
=50x(31+21)-3x(31-21)
=50x52-3x10
=2600-30
=2570
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评论
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你对这个回答的评价是?
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