0.63*27+1.9*(4.3-2.2)的简便算法
问题描述:
0.63*27+1.9*(4.3-2.2)的简便算法
答
0.63*27+1.9*(4.3-2.2)
=0.63*27+1.9*2.1
=2.1*8.1+1.9*2.1
=2.1*(8.1+1.9)
=2.1*10
=21