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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