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楼主: wangxiaoxiao
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翻了10翻

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发表于 2015-3-2 17:23 | 显示全部楼层
那女儿说的没错,确实教材中明确了翻了10翻就是10倍,而不是数学中的2的10次方

点评

???那女儿说的是10翻就是1024倍,是数学教材上的习题。不是你说的教材中翻了10翻就是10倍,可惜我没有听明白是哪个年级的  发表于 2015-3-2 21:18
发表于 2015-3-2 20:37 | 显示全部楼层
下面这个故事好像能说明点问题,请阅:
儿子从小就想参军,今天终于跟父亲说:我要参军保卫国家,如果美帝胆敢入侵……
      “啪”做父亲的一个耳光扇过来。“家人还保卫不了,保卫国家?你都跟我说说,美国人要抢你啥了?国家啥东西需要你保卫了?”
      子:保卫我们中华文化……
      父:美国让朝鲜人抹掉他们的历史了没?抹了也不会跟我们争长白山了!美国拆了靖国神社没?就是供奉杀了几十万美军的东条英机那个!美国逼阿富汗、伊拉克人改信基督了没?攻击美国的恐怖分子99%都是回教徒!
      子:没……
      父:那你觉得美国人会咋样灭了我们的文化?焚书坑儒?还是破四旧?
      子:我要保卫咱的土地……
      父:嘿嘿,你先跟我说说,你哪来的土地了?连几十平的套间都买不起,就算买得起也是暂时的使用权,还土地?等你有了土地再去保护吧!
      子:美国想吞并我们……
      父:你不是想出国吗?你的同学不是一大堆想出国吗?吞并了把出国也省了
      子:那不一样,出国是为了将来回来建设家乡,如果我们 5000年的中国没了,变成美国了,呜呜……
      父:谁说中国有5000年的?咱以前最风光的时候叫汉、唐,“中国”也就叫了100年,两千年来最穷的100年,改了多少回名了:汉、唐、宋、明、清……再改一回又何妨?
      子:被美国吞并了,都是白人说了算,华人都成二等公民
      父:听说美国选总统都是一人一票。要合并了咱中国,十三亿华人对他两亿白人,最后选出来总统还不是咱华人!
      子:美国人来了,会颠覆我们人民政府。我要保卫人民政府!
      父:“啪”(又一个耳光)
      你究竟想保卫谁?税局?财政部?证监委?城管?保监局?教育部?卫生部?药监局?劳动保障局?公路局?房管局?计生办?还是足协?
      看我不打断你的腿……

画外音:军不军费和我们有啥关系呢?国家的事不是P民能讨论的,熄灯睡觉!

点评

LZQ
美国选举也不是一人一票。  发表于 2015-3-2 23:54
LZQ
这是另一个问题。  发表于 2015-3-2 23:53
我帖子尽量想法避免别的,其实就是只说“翻了10翻”  发表于 2015-3-2 22:58
发表于 2015-3-2 20:56 | 显示全部楼层
翻翻指的是每次都翻倍,但是每次的基数是增长的,你算算就知道十翻是什么意思了,把十翻理解为十倍,那是小学数学没学好而已。
发表于 2015-3-2 21:00 | 显示全部楼层
1块钱,翻一番后就是2块,2块翻一番就是4块,4块翻一番就是8块,

好了,那么问题来了,1块钱翻三番是多少钱?是不是8块?

点评

翻两番就是4块啊!  发表于 2015-3-4 20:57
这就是说的翻了几番的问题来源,一块钱翻了一翻是2块,翻了2翻不知是多少。  发表于 2015-3-2 23:08
 楼主| 发表于 2015-3-2 21:20 | 显示全部楼层
还有一个小问题,如果说按照倍数,翻了一翻是多少?翻了两翻又是多少?
 楼主| 发表于 2015-3-2 23:22 | 显示全部楼层
不管事实上大家的理解是多少,有一点要说明(首个帖子我可能没说清楚):那个女孩说的是书上说的翻了几番就是2的几次方,这个正月十六以后再去问问孩子们,至少我要知道那个年纪的数学书说的、原题是什么。孩子在上学的朋友也可以提前问一下有没有碰到过。
其实平时我们很少用翻了几翻这个词,倒是另一个“增加了XX倍”,在大家命题时是被明确禁止使用的,理科教师命题只允许使用“增加为原来的xx倍”,不允许使用“增加了XX倍”,因为后者是个不规范用词,就是意义不明确的意思。1“增加了9倍”,大家习惯的是变成了9,1“增加了1倍”跟1“增加了两倍”,习惯的是都认为变成了2.但命题这样出就是大事故,因为命题不允许有明确不科学的问题。

点评

习惯怎么说都无所谓,我很关注到底哪个年级数学习题上的  发表于 2015-3-2 23:27
 楼主| 发表于 2015-3-2 23:26 | 显示全部楼层
因为参加过一次命题交流,听过题库交流中心的专家谈起,如果2增加了10倍,标准的答案是变成22(这个数值就是他举得例子),但因为习惯上没有人这样使用,与习惯不符,所以标准习题中是不准出现这个词的。只允许“增加为原来的xx倍”,这个不会被误解
 楼主| 发表于 2015-3-2 23:29 | 显示全部楼层
网页打开太慢了,平均15分钟才打开一个,没看到要找的内容,还是把打开的着一个复制过来大家看看有没有类似数值(只打开了第一页,第二页打不开了)
The Ultimate Nightmare: Are the U.S. and China Destined for War?
Will the eagle and the dragon meet on the battlefield?

Harry J. Kazianis,
February 27, 2015
Tweet
There is no geo-strategic relationship of more importance than that of the U.S. and China. Yet, tensions between Washington and Beijing over the last few years have been building. Over the last few weeks I have been exploring on these pages some of the pathways the unthinkable could happen: a U.S.-China war. We have also been exploring the various paths to victory both sides could utilize. While all of this is important, it is also important to take a step back and look at the U.S.-China relationship from another viewpoint of equal and possibly even greater value—a dilemma in the relationship that is creating its own set of tensions: the budding high-tech security dilemma pitting Washington and Beijing against one another.

While both sides have benefitted from decades of fruitful economic, cultural, and diplomatic ties since the restoration of formal relations in the 1970s, the dynamic of this important relationship is becoming increasingly competitive. Due to a host of factors such as the loss of a common foe (the Soviet Union), existing Asia-Pacific alliance dynamics, economic competition, territorial claims and counterclaims in the East and South China Sea and the rapid deployment of advanced conventional weapons platforms on both sides Washington and Beijing find themselves in an increasingly dangerous security dilemma.

While there have been various security dilemmas sprinkled throughout the pages of history, the U.S.-Sino security dilemma introduces a dangerous twist—a reliance on sophisticated types of military technology that rewards the side who strikes first and the hardest across all possible domains of conflict.


For example, as China develops increasingly effective methods for keeping outside powers out of the region (a good example is the DF-21D anti-ship missile), the U.S. seeks ways to maintain access to the region along with maintaining vital power projection capabilities. A good example is Washington relying on nuclear powered attack submarines armed with tomahawk land attack cruise missiles (TLAMS) to attack Chinese command and control nodes and “break the kill chain.” Such a move has pushed China to begin the deployment of sonar nets in the East, South, and South China Seas.

Such a budding security dynamic presents a clear and self-reinforcing challenge: when one side introduces a weapons platform or system this then induces the other side to match or surpass it through increasingly sophisticated technology. Such a dilemma pits the world’s two largest economies—armed with nuclear weapons—on a dangerous path that must be avoided.

The motivations on both sides of this budding security dilemma are important—specifically how their signature efforts to combat each others militaries—on the Chinese side anti-access/area denial, and for the American side what was known as the Air-Sea Battle Concept now known as JAM-GC—are likely feeding such a security dilemma.

Chinese motivations for the utilization of anti-access/area-denial or what many call A2/AD have roots across Chinese philosophy, history and careful study of the recent past. Looking back at U.S. military campaigns over the last several decades, American strategy has largely involved building force levels in mass close to a theater of operations before striking—almost always uninterrupted—allowing tremendous strategic advantage. Utilizing an A2/AD military strategy, Beijing would attempt to eliminate such strategic advantage.

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