计算下面题,要写出主要计算过程,能用简便方法的要用简便方法计算 ①2.4÷16×800 ②265.3÷1.
计算下面题,要写出主要计算过程,能用简便方法的要用简便方法计算①2.4÷16×800②265.3÷1.25÷8③0.75×18÷0.15④2.5×3.2×1.25⑤5.2...
计算下面题,要写出主要计算过程,能用简便方法的要用简便方法计算 ①2.4÷16×800 ②265.3÷1.25÷8 ③0.75×18÷0.15 ④2.5×3.2×1.25 ⑤5.23+4.8÷12 ⑥12.65×2.8-2.65×2.8.
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①2.4÷16×800,
=0.15×800,
=120;
②265.3÷1.25÷8,
=265.3÷(1.25×8),
=265.3÷10,
=26.53;
③0.75×18÷0.15,
=(0.75÷0.15)×18,
=5×18,
=90;
④2.5×3.2×1.25,
=(2.5×4)×(0.8×1.25),
=10;
⑤5.23+4.8÷12,
=5.23+0.4
=5.63;
⑥12.65×2.8-2.65×2.8,
=2.8×(12.56-2.56),
=2.8×10,
=28.
=0.15×800,
=120;
②265.3÷1.25÷8,
=265.3÷(1.25×8),
=265.3÷10,
=26.53;
③0.75×18÷0.15,
=(0.75÷0.15)×18,
=5×18,
=90;
④2.5×3.2×1.25,
=(2.5×4)×(0.8×1.25),
=10;
⑤5.23+4.8÷12,
=5.23+0.4
=5.63;
⑥12.65×2.8-2.65×2.8,
=2.8×(12.56-2.56),
=2.8×10,
=28.
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