48_2.8ᠧ4.2怎么简便运算?

2025-02-28 07:27:42
推荐回答(1个)
回答1:

48-2.8×4.2
=48-(3-0.2)×4.2
=48-(3×4.2-0.2×4.2)
=48-12.6+0.84
=35.4+0.84
=36.24