方法1.2^10 = 2⁴*2⁴*2² = 16 * 16 * 4 = 256 * 4 = 1024
方法2.2^10 = 2^5 *2^5 = 32 *32 =1024
方法3.2^10 = 2² *2² *2² *2² *2² = 4 * 4 *4 *4 * 4 = 16 * 16 * 4 = 1024