0.22+0.44+0.66+0.88+1.1+1.12+2.24+3.36+4.48+5.6的和,要求简便计算

问题描述:

0.22+0.44+0.66+0.88+1.1+1.12+2.24+3.36+4.48+5.6的和,要求简便计算

原式
=0.22*(1+2+3+4+5)+1.12*(1+2+3+4+5)
=(0.22+1.12)*(1+2+3+4+5)
=1.34*15
=20.1