题目内容
【题目】选择你喜欢的方法计算.
(1)5.4÷10.8+2÷2.5
(2)6.9×9.9
(3)(27.2-23.6)×0.25
(4)3.72×2.9+3.72×7.1
【答案】(1)1.3
(2)68.31
(3)0.9
(4)37.2
【解析】
(1)5.4÷10.8+2÷2.5
=0.5+0.8
=1.3
(2)6.9×9.9
=6.9×(10-0.1)
=6.9×10-6.9×0.1
=69-0.69
=68.31
(3)(27.2-23.6)×0.25
=3.6×0.25
=0.9
(4)3.72×2.9+3.72×7.1
=3.72×(2.9+7.1)
=3.72×10
=37.2
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