12.2+7.8-12.2+7.8怎样算简便?

2025-03-10 13:21:16
推荐回答(4个)
回答1:

12.2+7.8-12.2+7.8的简便运算:
12.2+7.8-12.2+7.8
=12.2-12.2+7.8+7.8
=(12.2-12.2)+(7.8+7.8)
=0+15.6
=15.6

回答2:

12.2+7.8-12.2+7.8
=(12.2-12.2)+(7.8+7.8)
=0+15.6
=15.6

回答3:

12.2+7.8-12.2+7.8
=12.2-12.2+7.8+7.8
=15.6

回答4:

=(12.2-12.2)+(7.8+7.8)
=0+15.6
=15.6