3.5×198怎样简便脱式计算
3.5 x 198
=3.5x(200-2)
=3.5 x 200-3.5x2
=700-7
=693
=3.5x(200-2)
=3.5 x 200-3.5x2
=700-7
=693
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第1个回答 2016-09-24
先算出3.5*200=700,再算出3.5*2=7,然后700-7=693