3.14ᘧ࿾1.9锧31.4ᘧ࿾0.81怎么简便计算?

2024-11-25 10:28:35
推荐回答(2个)
回答1:

3.14×1.9+31.4×0.81
=3.14×1.9+3.14×10×0.81
=3.14×(1.9+8.1)
=3.14×10
=31.4

回答2:

3.14×1.9+31.4×0.81
=31.4×0.19+31.4×0.81
=(0.19+0.81)×31.4
=1×31.4
=31.4