4.9X1.02用简便方法计算?

2025-06-25 21:25:32
推荐回答(1个)
回答1:

4.9×1.02
=(5-0.1)×(1+0.02)
=5×1+5×0.02-0.1×1-0.1×0.02
=5+0.1-0.1-0.002
=4.998