（1）6.43+2.58-6.43+2.58（2）6.6*9.8_数学解答

（1）6.43+2.58-6.43+2.58
（2）6.6*9.8

人气：487 ℃　时间：2020-02-05 21:32:27

解答

6.43+2.58-6.43+2.58
=6.43-6.43+2.58+2.58
=5.16
6.6*9.8
=6.6*10-6.6*0.2
=66-1.32
=64.68