简便算法 12.8加2.04乘9.5_数学解答

简便算法 12.8加2.04乘9.5

人气：340 ℃　时间：2020-02-05 12:08:58

解答

12.8+2.04*9.5
=12.8+2.04*(10-0.5)
=12.8+2.04*10-2.04*0.5
=12.8+20.4-1.02
=33.2-1.02
=32.18