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【OG20-P153-53题】
Which of the following is closest to √4.2(1590)15.7 ?
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4.2*1590/15.7≈4.2*100≈400,原式≈20
题目讨论 (1条评论)

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288762fblyv
4.2*1590/15.7≈4.2*1590/15.9=4.2*100,之后开根,大概是20√15
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0 回复 2022-07-09 21:39:39