用递等式计算(能用简便方法计算的尽可能用简算)
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用递等式计算(能用简便方法计算的尽可能用简算)
(12)0.4×(3.2-0.8)÷0.15 (13)5.7+1.9×0.2÷7.6
(14)32.4×6.3+32.4×3.7 (15)18.2-10.6×(0.9-0.75)
(16)0.25×3.85×40 (17)1.46×3.5+3.5×4.54.
(12)0.4×(3.2-0.8)÷0.15 (13)5.7+1.9×0.2÷7.6
(14)32.4×6.3+32.4×3.7 (15)18.2-10.6×(0.9-0.75)
(16)0.25×3.85×40 (17)1.46×3.5+3.5×4.54.
![用递等式计算(能用简便方法计算的尽可能用简算)](/uploads/image/z/3115783-55-3.jpg?t=%E7%94%A8%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%88%E8%83%BD%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E7%9A%84%E5%B0%BD%E5%8F%AF%E8%83%BD%E7%94%A8%E7%AE%80%E7%AE%97%EF%BC%89)
(12)0.4×(3.2-0.8)÷0.15,
=0.4×2.4÷0.15,
=0.96÷0.15,
=6.4;
(13)5.7+1.9×0.2÷7.6,
=5.7+0.38÷7.6,
=5.7+0.05,
=5.75;
(14)32.4×6.3+32.4×3.7,
=32.4×(6.3+3.7),
=32.4×10,
=324;
(15)18.2-10.6×(0.9-0.75),
=18.2-10.6×0.15,
=18.2-1.59,
=16.61;
(16)0.25×3.85×40,
=0.25×40×3.85,
=10×3.85,
=38.5;
(17)1.46×3.5+3.5×4.54,
=3.5×(1.46+4.54),
=3.5×6,
=21.
=0.4×2.4÷0.15,
=0.96÷0.15,
=6.4;
(13)5.7+1.9×0.2÷7.6,
=5.7+0.38÷7.6,
=5.7+0.05,
=5.75;
(14)32.4×6.3+32.4×3.7,
=32.4×(6.3+3.7),
=32.4×10,
=324;
(15)18.2-10.6×(0.9-0.75),
=18.2-10.6×0.15,
=18.2-1.59,
=16.61;
(16)0.25×3.85×40,
=0.25×40×3.85,
=10×3.85,
=38.5;
(17)1.46×3.5+3.5×4.54,
=3.5×(1.46+4.54),
=3.5×6,
=21.