3.72×49+37.2×5.1+49×51
=37.2×﹙4.9+5.1﹚+﹙50-1﹚×﹙50+1﹚
=372+2500-1
=2871.
3.72*49+37.2*5.1+49*51=?简便计算!
3.72*49+37.2*5.1+49*51=?简便计算!
数学人气:674 ℃时间:2019-12-25 07:10:33
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