3.3ᘧ࿾6.6锧9.9ᘧ࿾7.8的简便方法?

2025-01-01 13:09:43
推荐回答(1个)
回答1:

3.3×6.6+9.9×7.8
=3.3×3×2.2+9.9×7.8
=9.9×2.2+9.9×7.8
=9.9×(2.2+7.8)
=9.9×10
=99