题目内容

【题目】计算下面各题,能简算的要简算。

①4.5×3.7+3.57

②4.68×2.5+5.32×2.5

③12.5×2.5×32

④0.29×99

⑤7.2÷1.2÷6

⑥4.8﹣4.8÷1.6

⑦28.98÷6.3﹣3.15

⑧(10﹣0.8×11)÷0.15

【答案】①20.22;②25;③1000;④28.71

⑤1;⑥1.8;⑦1.45;⑧8

【解析】

①4.5×3.7+3.57

=16.65+3.57

=20.22

②4.68×2.5+5.32×2.5

=2.5×(4.68+5.32)

=2.5×10

=25

③12.5×2.5×32

=12.5×2.5×(8×4)

=(12.5×8)×(2.5×4)

=100×10

=1000

④0.29×99

=0.29×(100﹣1)

=0.29×100﹣0.29×1

=29﹣0.29

=28.71

⑤7.2÷1.2÷6

=7.2÷(1.2×6)

=7.2÷7.2

=1

⑥4.8﹣4.8÷1.6

=4.8﹣3

=1.8

⑦28.98÷6.3﹣3.15

=4.6﹣3.15

=1.45

⑧(10﹣0.8×11)÷0.15

=(10﹣8.8)÷0.15

=1.2÷0.15

=8

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