5.25乘以7.8加上5.25除以5怎么简算_数学解答

5.25乘以7.8加上5.25除以5怎么简算

人气：472 ℃　时间：2020-03-19 19:57:48

解答

=5.25×7.8+5.25×(1/5)
=5.25×7.8+5.25×0.2
=5.25×(7.8+0.2)
=5.25×8
=(5+0.25)×8
=5×8+0.25×8
=40+2
=42