42x120用简便方法计算
42x120
=42xï¼100+20ï¼
=42x100+42x20
=4200+840
=5040
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=42xï¼100+20ï¼
=42x100+42x20
=4200+840
=5040
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第1个回答 2016-05-31
42 x 120
= 40 x 120 + 2 x 120
=4800 + 240
=5040本回答被网友采纳
= 40 x 120 + 2 x 120
=4800 + 240
=5040本回答被网友采纳
