求大神解答_百度知道
求大神解答
学校买来4种图书,甲种图书是其他3种书的一半,乙种书是其他三种的三分之一,丙图书是其他三种书的四分之一,丁种书有91本,那么四种书共多少本?有两块试验地，一块种菜一块种麦子。已知菜地的一半和麦地的三分之一是13平方米，麦地的一半和菜地的三分之一是12平方米，求两块各多少平方米求过程，最好算术方法，方程只设一个数的
提问者采纳
(1)甲图书是其他书的一半，所以是整个图书总数的1/3乙图书是其他书的1/3，所以是整个图书总数的1/4丙图书是其他书的1/4，所以是整个图书总数的1/5因此丁占图书总数的：1-1/3-1/4-1/5=13/60因此图书总数为：91÷13/60=420本（2）菜地的一半和麦地的1/3是13平方米，乘以2则菜地总面积和麦地面积的2/3是26平方米同样麦地总面积和菜地面积的2/3是24平方米可见麦地面积的1/3比菜地面积的1/3少2平方米因此麦地面积比菜地面积少6平方米菜地总面积的与麦地面积的2/3比菜地总面积与菜地面积的2/3少4平方米即菜地面积的1+2/3为：26+4=30平方米所以菜地面积为：30÷（1+2/3）=18平方米麦地面积为18-6=12平方米
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很多的英语题求大神解答 A lot of English people have three names: a first name, a middle name and a family name. Their family name comes last. For example, my full name is James Allan Green. Green is my family name. I have two given names.
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