九点九九乘以二点二加上三点三三乘以三减三十的简便方法怎么﷿

2025-05-04 21:20:46
推荐回答(1个)
回答1:

九点九九乘以二点二加上三点三三乘以三减三十
=3.33x(6.6+3)-30
=3.33x9.6-3x10
=3x1.11x9.6-3x10
=3x(10.656-10)
=1.968