3.72*49+37.2*5.1+49*51=?简便计算!
问题描述:
3.72*49+37.2*5.1+49*51=?简便计算!
答
3.72×49+37.2×5.1+49×51
=37.2×﹙4.9+5.1﹚+﹙50-1﹚×﹙50+1﹚
=372+2500-1
=2871.