题目内容

【题目】脱式计算演练场。

7.8÷2.5÷4 640÷0.4÷0.2 8.3×9.9+0.83

8.48+2.6×3.2 0.78×15÷0.3 0.18÷0.24÷0.025

【答案】0.78 8000 83 16.8 39 30

【解析】

①7.8÷2.5÷4 

=7.8÷(2.5×4)

=7.8÷10

=0.78;

②640÷0.4÷0.2 

=1600÷0.2

=8000;

③8.3×9.9+0.83

=8.3×9.9+8.3×0.1

=8.3×(9.9+0.1)

=8.3×10

=83;

④8.48+2.6×3.2 

=8.48+8.32

=16.8;

⑤0.78×15÷0.3 

=11.7÷0.3

=39;

⑥0.18÷0.24÷0.025

=0.75÷0.025

=30。

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