GMAT数学辅导:算术知识点全解析
整除特性:
能够被2整除的数其个位一定是偶数。
能够被3整除的数是各位数的和能够被3整除。
能够被4整除的数是最后两位数能够被4整除。
能够被5整除的数的个位是0或5。
能够被8整除的数是最后三位能够被8整除。
能够被9整除的数是各位数的和能够被9整除。
能够被11整除的数是其奇数位的和减去偶数位的和的差值可以被11整除。
记住:一个数要想被另一个数整除,该数需含有对方所具有的质数因子。
整数n次幂尾数特性:
尾数为2的数的幂的个位数一定以2,4,8,6循环
尾数为3的数的幂的个位数一定以3,9,7,1循环
尾数为4的数的幂的个位数一定以4,6循环
尾数为7的数的幂的个位数一定以7,9,3,1循环
尾数为8的数的幂的个位数一定以8,4,2,6循环
尾数为9的数的幂的个位数一定以9,1循环
例:7123 和3 的个位哪个大?
7和3幂的个位数均每4次循环一次,则将7123的幂指数1234余3,因此7123的个位数一定为3,同理将3 的幂指数3214余1,则3 的个位为3,则与7123的3 个位数相同。
下一篇: GMAT数学需要较强的推理能力
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