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39-5.2*7.4
人气:262 ℃ 时间:2020-03-29 16:27:15
解答
39 - 5.2 × 7.4
= 39 - 5.2 × (7.5 - 0.1)
= 39 - 5.2 × 7.5 + 0.52
= 39 - 39 + 0.52
= 0.52
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