外国语学校小升初入学考试中英文奥数题库1精品资料.pdf

外国语学校小升初英语奥数训练题 第一部分 1155 1、三个素数的倒数之和是 ，则这三个素数中最大的是多少？ 2006 1155 1. The sum of the reciprocals of three prime numbers is , so what is the greatest 2006 one among the three prime numbers? 4 14 2、有一个分数， 它的分子加 2，可以约简为 ；它的分母减 2，可以约简为 。 7 25 这个分数是多少？ 4 2. There is a fraction. If its numerator adds 2, it can be reduced to be ; if its 7 14 denominator subtracts 2, it can be reduced to be . So what is this fraction? 25 1 10 20 3、一个数分别除以 1 ， ， ，所得的商都是自然数。 这个数最小是多少？ 14 21 49 1 10 20 3. A number is divided by 1 , and respectively and the quotients are all 14 21 49 natural numbers. So what is the minimum value of this number? 4 、一片竹林，去年不开花的竹子比开花的 2 倍还多 55 棵，今年又多了 100 棵 开花，这时开花的竹子恰好是不开花的 4 倍，这片竹林有多少棵竹子？ 4. There is a bamboo forest. Last year, the non-blooming bamboos were two times and 55 more than the blooming bamboos. With another 100 bamboos blooming this year, the blooming bamboos are four times as many as the non-blooming bamboos. So, how many bamboos are there in this forest? （红色的地方我有点不确定，葛老师您看看应该怎么翻） 1 1 1 1 1 1 5、从 中去掉两个分数，余下的分数之和为 1。这两个分 2 4 6 8 10 12 数是哪