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
3.72x(49+51)+49x51
=3.72x100+(50-1)x51
=372+51x50-51
=372+2551-51
=2871
答
3.72×49+37.2×5.1+49×51
=37.2×﹙4.9+5.1﹚+﹙50-1﹚×﹙50+1﹚
=372+2500-1
=2871.