题目内容
【题目】计算下面各题,怎样简便怎样算。
(1)0.26×2.5+0.74×2.5
(2)72.8÷0.91-6.5
(3)0.47×9.9
(4)0.8×1.08÷0.27
【答案】(1)2.5
(2)73.5
(3)4.653
(4)3.2
【解析】
(1)0.26×2.5+0.74×2.5
=2.5×(0.26+0.74)
=2.5×1
=2.5
(2)72.8÷0.91-6.5
=80-6.5
=73.5
(3)0.47×9.9
=0.47×(10-0.1)
=0.47×10-0.47×0.1
=4.7-0.047
=4.653
(4)0.8×1.08÷0.27
=0.8×(1.08÷0.27)
=0.8×4
=3.2
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