如题所述
99×51
=(100-1)×51
=100×51-1×51
=5100-51
=5049
=(100-1)×51
=100×51-1×51
=5100-51
=5049
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第1个回答 2016-06-25
99X51=99X50+99X1
=100X50-50+100-1
=5000+100-50-1
=5049
=100X50-50+100-1
=5000+100-50-1
=5049