4.89×9.9+4.89÷10和3.65÷0.25+6.35×4的简便方法计算
16点之前,急啊————————————————
人气:394 ℃ 时间:2020-04-21 08:13:24
解答
4.89×9.9+4.89÷10
=4.89x9.9+4.89x0.1
=4.89x(9.9+0.1)
=4.89x10
=48.9
3.65÷0.25+6.35×4
=3.65x4+6.35x4
=(3.65+6.35)x4
=10x4
=40
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