31×99脱式简便运算
31Ã99
=31Ãï¼100-1ï¼
=31Ã100-31Ã1
=3100-31
=3069
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=31Ãï¼100-1ï¼
=31Ã100-31Ã1
=3100-31
=3069
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第1个回答 2016-03-26
31×99
=31x(100-1)
=31x100-31x1
=3100-31
=3069
希望能帮到你!
=31x(100-1)
=31x100-31x1
=3100-31
=3069
希望能帮到你!