一道数学题说明白德氢是做什么的?和病痛赛跑,拔河比赛
一口井10米,一只蜗牛每天白天爬上3米,晚上下滑2米,爬出这口井需要几天?https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fn.sinaimg.cn%2Fsinacn00%2F218%2Fw658h360%2F20180316%2F99c0-fyshfup9962718.jpg&refer=http%3A%2F%2Fn.sinaimg.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1657546507&t=4845c8dfde920272c7c8bfb16c33cd87
https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fbbwxjy.com%2FrootFiles%2Fupload%2Fimage%2F20200525%2F15903740699421538.jpg&refer=http%3A%2F%2Fbbwxjy.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1657546381&t=d37954d77de02422a4e61d96d05d7200
分析:这只蜗牛向上爬3米后回滑下2米,实际每天只向上爬了3-2=1米,
但在最后一天不需要回滑爬了3米,这样就需要先去掉最后一天爬的剩下10-3=7米,
再用7÷1=7天。也就是前面7天爬了7米,剩下3米,第8天,
向上爬3米就到了。
列式:10-3=7(米) 3-2=1(米) 7÷1=7(天) 7+1=8(天)
https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fbpic.588ku.com%2Felement_origin_min_pic%2F19%2F12%2F27%2F7fb0d26624d147bc9d355f244a4d3f0b.jpg&refer=http%3A%2F%2Fbpic.588ku.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641305360&t=0c3c7da080c8f801b801a09614335c81
https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fjkq.kunming.cn%2Fupload%2Fresources%2Fimage%2F2018%2F01%2F23%2F1278837.jpg&refer=http%3A%2F%2Fjkq.kunming.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641305659&t=beb80717faf9d0ebbcbaa82635e136e7
https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fwww.itra.fcu.edu.tw%2FwSite%2Fpublic%2FData%2Ffcu_epaper%2Ffcuweekly%2F101-200%2F116605.jpg&refer=http%3A%2F%2Fwww.itra.fcu.edu.tw&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641305556&t=753602a974506775e516063fd96f6e2a
https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fnews.upc.edu.cn%2F__local%2FF%2FBD%2F10%2F7B44C21A2EB1E16DADD44C992DE_4FA4FDD6_7E9AAA.jpg%3Fe%3D.jpg&refer=http%3A%2F%2Fnews.upc.edu.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641305586&t=6842d8d48ca69462db264447b35ee2fd
氢气与自由基-毒素的拔河比赛
健康观念与不良生活习惯的赛跑
吸氢气的速度和量,与自由基产生的速度和量之间的较量
https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fpic2.zhimg.com%2Fv2-d755467cd13eaeda1845e44ea7de4d10_1440w.jpg%3Fsource%3D172ae18b&refer=http%3A%2F%2Fpic2.zhimg.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1657546754&t=0aa62af7f0970b1b1c60dc37c7bec6dd
https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fnews.oit.edu.cn%2F__local%2FF%2FE6%2FC2%2F92BFEE3ECDFB9F6E48FEB6EFCA1_C5B4FBA3_58E8D2.jpg&refer=http%3A%2F%2Fnews.oit.edu.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641305981&t=1fa9eb7aa7d4222c5b6f36cfb286d5a5
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