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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