15.58÷8.2-0.72 4.5×1.2-3.15÷15 如何简便计算?_数学解答

15.58÷8.2-0.72 4.5×1.2-3.15÷15 如何简便计算?

人气：113 ℃　时间：2020-01-26 04:42:54

解答

15.58÷8.2-0.72
=(1.9×8.2)÷8.2-0.72
=1.9-0.72
=1.184.5×1.2-3.15÷15
=4.5×(1+0.2)-(15×0.21)÷15
=4.5+0.9-0.21
=5.4-0.21
=5.19