发布时间:2025-02-06 03:41:40
设规定时间为x
5000\x=5000\x+2+125
解x1=-10。 x2=8
-10舍掉
用来烧水的水壶,常常会有一层厚厚的水垢,有哪几种方法可以去除水垢
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