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4/9×[0.75-(7/16-0.25)] 能简便就用简便方法计算
人气:249 ℃ 时间:2020-04-03 22:25:45
解答
4/9×[0.75-(7/16-0.25)]
= 4/9×[0.75-7/16+0.25]
= 4/9×[1-7/16]
=4/9×9/16
=1/4
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