1樓:萌神右翼′滏
(1)0.25×8.75×4,
=0.25×4×8.75,
=100×8.75,
=875;
(2)25.8×7+3×25.8,
=25.8×(7+3),內
=25.8×10,
=258;
(3)10÷容0.2÷2.5,
=10÷(0.2×2.5),
=10÷0.5,
=20;
(4)21.36÷0.8-12.9,
=26.7-12.9,
=13.8.
計算下面各題(能簡便的用簡便方法計算).10.15-10.75×0.4-5.75.8×(3.87-0.13)+4.2×3.7432.52-(6+
2樓:慄鎖
(bai1)10.15-10.75×
du0.4-5.7,
zhi=10.15-4.3-5.7,
=10.15-(dao4.3+5.7),
=10.15-10,
=0.15;
(2)5.8×(3.87-0.13)+4.2×3.74,=5.8×3.74+4.2×3.74,
=(5.8+4.2)×專3.74,
=10×3.74,
=37.4;
(3)32.52-(6+9.728)÷屬3.2×2.5,=32.52-15.728÷3.2×2.5,=32.52-4.915×2.5,
=32.52-12.2875,
=20.2325;
(4)[(7.1-5.6)×0.9-1.15]÷2.5,=[1.5×0.9-1.15]÷2.5,
=[1.35-1.15]÷2.5,
=0.2÷2.5,
=0.08;
(5)5.4÷[2.6×(3.7-2.9)+0.62],=5.4÷[2.6×0.8+0.62],
=5.4÷[2.08+0.62],
=5.4÷2.7,
=2;(6)[20-(90.75÷6.6+2.25)]×11.6,=[20-(13.75+2.25)]×11.6,=[20-16]×11.6,
=4×11.6,
=46.4.
用簡便方法計算下面各題，用簡便演算法計算下面各題。
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