简便方法计算各题 4.86×9.9 4.9×1.02
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简便方法计算各题 4.86×9.9 4.9×1.02
![简便方法计算各题 4.86×9.9 4.9×1.02](/uploads/image/z/13593270-30-0.jpg?t=%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E5%90%84%E9%A2%98+4.86%C3%979.9+4.9%C3%971.02)
4.86×9.9
=4.86×(10-0.1)
=4.86×10-4.86×0.1
=48.6-0.486
=48.114
4.9×1.02
=4.9×(1+0.02)
=4.9×1+4.9×0.02
=4.9+0.098
=4.998
=4.86×(10-0.1)
=4.86×10-4.86×0.1
=48.6-0.486
=48.114
4.9×1.02
=4.9×(1+0.02)
=4.9×1+4.9×0.02
=4.9+0.098
=4.998