题目内容

【题目】脱式计算,能简便计算的要简算。

13÷0.4÷2.5 64×4.536×4.5 1.25×2.5×0.8

1.5×101-1.5 14.643.7×2.8 3.6÷0.24×5.1

【答案】13;450;2.5;

150;25;76.5

【解析】

13 ÷ 0.4 ÷ 2.5            

= 13 ÷ (0.4 × 2.5)

= 13 ÷ 1

= 13

64 × 4.5 + 36 × 4.5 

= (64 + 36) × 4.5

= 100 × 4.5

= 450

1.25 × 2.5 × 0.8

= (1.25 × 0.8) × 2.5

= 1 × 2.5

= 2.5 

1.5 × 101 - 1.5    

= 1.5 × (101 - 1)

= 1.5 × 100

= 150

14.64 + 3.7 × 2.8

= 14.64 + 10.36

= 25

3.6 ÷ 0.24 × 5.1

= 15 × 5.1

= 76.5

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