如何简算6.3乘以27加1.9乘以21
问题描述:
如何简算6.3乘以27加1.9乘以21
答
6.3*27+1.9*21=3*2.1*27+1.9*21=21*(0.3*27+1.9)=21*(8.1+1.9)=210
答
= 6.3 * 3 * 9 + 1.9 * 3 * 7
= 3 * 56.7 + 3 * 13.3
= 3 * (56.7 + 13.3)
= 3 * (70.0)
= 210