54/45 280/25 的简便计算_数学解答

54/45 280/25 的简便计算

人气：302 ℃　时间：2020-06-17 16:24:20

解答

54 / 45
= 54 / (9 X 5)
= 6 / 5
= 12 / 10
= 1.2
280 / 25
= 4 X 4 X 70 / 25 X 4
= 2 X 560 / 100
= 2 X 5.6
= 11.2