(6.9-3.15)÷0.3×0.8
=6.9 ÷0.3×0.8-3.15÷0.3×0.8
=18.4-8.4
=10
2.5×(1.9+1.9+1.9+1.9)
=2.5×4×1.9
=10×1.9
=19
(6.9-3.15)÷0.3×0.8 2.5×(1.9+1.9+1.9+1.9)简便计算要怎么算啊
(6.9-3.15)÷0.3×0.8 2.5×(1.9+1.9+1.9+1.9)简便计算要怎么算啊
数学人气：372 ℃时间：2020-03-30 09:11:51
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