来自李振的问题
(1)6.43+2.58-6.43+2.58(2)6.6*9.8
(1)6.43+2.58-6.43+2.58
(2)6.6*9.8
1回答
2020-02-29 20:24
(1)6.43+2.58-6.43+2.58(2)6.6*9.8
(1)6.43+2.58-6.43+2.58
(2)6.6*9.8
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