4.2×(2.1+0.84÷2.1)简便算法

4.2×(2.1+0.84÷2.1)简便算法
2025-06-25 08:32:35
推荐回答(1个)
回答1:

4.2×(2.1+0.84÷2.1)
=4.2×(2.1+0.4)
=4.2×2.5
=10.5