请尽量给出详述,本人数学不好.The diagonal of the floor of a rectangular closet is 15/2 feet.The shorter side of the closet is 17/4 feet.What is the area of the closet in the square feet?这题我想的是(15/2)平方-(17/4)平方
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![请尽量给出详述,本人数学不好.The diagonal of the floor of a rectangular closet is 15/2 feet.The shorter side of the closet is 17/4 feet.What is the area of the closet in the square feet?这题我想的是(15/2)平方-(17/4)平方](/uploads/image/z/12562163-35-3.jpg?t=%E8%AF%B7%E5%B0%BD%E9%87%8F%E7%BB%99%E5%87%BA%E8%AF%A6%E8%BF%B0%2C%E6%9C%AC%E4%BA%BA%E6%95%B0%E5%AD%A6%E4%B8%8D%E5%A5%BD.The+diagonal+of+the+floor+of+a+rectangular+closet+is+15%2F2+feet.The+shorter+side+of+the+closet+is+17%2F4+feet.What+is+the+area+of+the+closet+in+the+square+feet%3F%E8%BF%99%E9%A2%98%E6%88%91%E6%83%B3%E7%9A%84%E6%98%AF%EF%BC%8815%2F2%EF%BC%89%E5%B9%B3%E6%96%B9-%EF%BC%8817%2F4%EF%BC%89%E5%B9%B3%E6%96%B9)
请尽量给出详述,本人数学不好.The diagonal of the floor of a rectangular closet is 15/2 feet.The shorter side of the closet is 17/4 feet.What is the area of the closet in the square feet?这题我想的是(15/2)平方-(17/4)平方
请尽量给出详述,本人数学不好.
The diagonal of the floor of a rectangular closet is 15/2 feet.The shorter side of the closet is 17/4 feet.What is the area of the closet in the square feet?
这题我想的是(15/2)平方-(17/4)平方然后开方,再乘17/4.可是答案并不是这个.
How many 3-digit positive integers are odd and do not contain the digit "5"
请尽量给出详述,本人数学不好.The diagonal of the floor of a rectangular closet is 15/2 feet.The shorter side of the closet is 17/4 feet.What is the area of the closet in the square feet?这题我想的是(15/2)平方-(17/4)平方
第一题我也是这么个思路.
第二题:按位数算.百位可取除5之外1~9,即8种可能.十位1~9,9种可能.个位满足奇数且不含5的,有1,3,7,9,4种可能.所以共有8*9*4=282个数.
三位正整数是奇数但不包括数字5的有多少个?
见http://zhidao.baidu.com/link?url=JNz3Hy8jlYm_dJqf-8iycvJaGVPlcopZ_XGmQS0gOfvVcojc555puAZFB57VaAko-55l7dXpKOG_GF28VW9Qgq
前面那个题做法没错,用勾股定理求出另一边,再求面积