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数学
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(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000
人气:421 ℃ 时间:2020-02-03 01:49:53
解答
1000x(1+0.5%)-5000x(1+0.5%)≥1000
x(1+0.5%)-5x(1+0.5%)≥1
-4.02x≥1
x≤-0.249
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