Question

7.2×0.48+0.72×5.2的简便运算？

Answer 1

你好。
如题干所示，通过10倍法，调整小数点位次，以便于计算：
7.2×0.48+0.72×5.2
＝(7.2÷10)×(0.48×10)+0.72×5.2
＝0.72×4.8+0.72×5.2
＝0.72×(4.8+5.2)
＝0.72×10
＝7.2
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Answer 2

=7.2×0.48+7.2×0.52
=7.2×(0.48+0.52)
=7.2
两个数相乘，一个扩大倍数，另一个就缩小相同的倍数。就像上面的0.72扩大了10倍，那么5.2就要缩小10倍

Answer 3

7.2×0.48+0.72×5.2的简便运算
=0.72×10×0.48+0.72×5.2
=0.72×(4.8+5.2)
=0.72×10
=7.2

Answer 4

7.2×0.48+0.72×5.2
=0.72×4.8+0.72×5.2
=0.72×(4.8+5.2)
=0.72×10
=7.2