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一.必备知识 1.填空。(1)在1～20这20个数中,最小的自然数与最大的偶数相乘是( );最小的奇数与最小的质数相加是( );最小的合数与最小的偶数相减是( )。(2)54有( )个约数。(3)120有( )个倍数。(4)在大于10的所有自然数中,如果一个数的约数和倍数都是它本身,这个数最小是( )。(5)与1互质的数有( )个。 2.下面的说法都不对,请找出错误并纠正。(1)能被2整除的最小偶数是10。(2)能被2、3、5整除的最大两位数是98。(3)任何质数都没有约数。(4)互质的两个数的最小公倍数是较大的那个数。(5)相邻的两个数没
I. Essential knowledge 1. Fill in the blanks. (1) Among the 20 numbers of 1 to 20, the smallest natural number is multiplied by the largest even number (); the sum of the smallest odd number and the smallest prime number is (); and the smallest composite number is the smallest one (). (2) 54 There are () a few divisors. (3) 120 has () multiples. (4) In all natural numbers greater than 10, if the divisor and the multiple of a number are themselves, the minimum number is (). (5) There are (1) numbers that are mutually prime to 1. 2. The following statement is wrong, please find out the error and correct it. (1) The smallest even number that can be divisible by 2 is 10. (2) The maximum double digit that can be divisible by 2, 3, and 5 is 98. (3) There is no divisor for any prime number. (4) The least common multiple of two prime numbers is the larger one. (5) No two adjacent numbers