问题
解答题
脱式计算(怎样算简便就怎样算).
(18.6-18.6÷3.1)×1.6
12.5×2.5×3.2
4.5÷18
32.9×0.46+5.4×3.29.
答案
(1)(18.6-18.6÷3.1)×1.6,
=(18.6-6)×1.6,
=12.6×1.6,
=20.16,
(2)12.5×2.5×3.2,
=(12.5×8)×(2.5×0.4),
=100×1,
=100,
(3)4.5÷18=0.25,
(4)32.9×0.46+5.4×3.29,
=3.29×(4.6+5.4),
=3.29×10,
=32.9.