72×0.81+8.1×2.8怎样用简便方法算?

2025-04-28 11:31:04
推荐回答(2个)
回答1:

72×0.81+8.1×2.8
=7.2x10x0.81+8.1x2.8
=7.2x8.1+8.1x2.8
=8.1x(7.2+2.8)
=8.1x10
=81

回答2:

72×0.81+8.1×2.8
= 7.2×8.1+8.1×2.8
= 8.1×10
= 81