9.8*2.7用简便方法_数学解答

9.8*2.7用简便方法

人气：340 ℃　时间：2020-05-13 06:01:56

解答

9.8×2.7
=（10-0.2）×2.7
=27-2.7×0.2
=27-[﹙3-0.3﹚×0.2]
=27-[0.6-0.06]
=27-0.6+0.06
=26.4+0.06
=26.46