七点2加 7点二,加0.72,乘以5.3的简便方法?

2025-12-16 11:04:38
推荐回答(1个)
回答1:

7.2+7.2+0.72ⅹ5.3
=7.2+7.2+7.2Ⅹ0.53
=2ⅹ7.2+0.53ⅹ7.2
=2.53ⅹ7.2
=18.216