Question

0.16×9.85＋264×0.0985＋72＋0.985

简算

Answer 1

0.16×9.85＋264×0.0985＋72＋0.985
=0.16×9.85＋2.64×9.85+72＋9.85×0.1
=0.16×9.85＋2.64×9.85＋9.85×0.1+72
=9.85×(0.16+2.64+0.1)+72
=9.85×2.9+72
=9.85×(3-0.1)+72
=9.85×3-9.85×0.1+72
=29.55-0.985+72
=100.565
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追问

为什么这样做 解释一下 免得我以后也不会

追答

观察都含有985这个数,先整理在一起

=0.16×9.85＋2.64×9.85＋9.85×0.1+72 化成同样的含有9.85

=9.85×(0.16+2.64+0.1)+72 利用加法结合律.整理起来

=9.85×2.9+72 >>>>>>> ×2.9比较麻烦 化成×(3-0.1)

=9.85×(3-0.1)+72
=9.85×3-9.85×0.1+72

=29.55-0.985+7

=100.565

追问

4800/12.5/2.5/3.2=？ 简算

追答

4800/(12.5×2.5×3.2)

=4800/(12.5×3.2×2.5)
=4800/(12.5×8×0.4×2.5)
=4800/[(12.5×8)×(0.4×2.5)]
=4800/(100×1)
=4800/100
=48

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谢谢你 你学习一定很棒