8的12次方可以表示为8^12，意味着将8连乘12次。简单计算如下：

8^1 = 8

8^2 = 8 × 8 = 64

8^3 = 8 × 8 × 8 = 512

8^4 = 8 × 8 × 8 × 8 = 4096

可以观察到，8每乘一次，结果就会乘以8。所以继续计算：

8^5 = 8^4 × 8 = 4096 × 8 = 32768

8^6 = 8^5 × 8 = 32768 × 8 = 262144

8^7 = 8^6 × 8 = 262144 × 8 = 2097152

8^8 = 8^7 × 8 = 2097152 × 8 = 16777216

继续计算：

8^9 = 8^8 × 8 = 16777216 × 8 = 134217728

8^10 = 8^9 × 8 = 134217728 × 8 = 1073741824

8^11 = 8^10 × 8 = 1073741824 × 8 = 8589934592

8^12 = 8^11 × 8 = 8589934592 × 8 = 68719476736

因此，8的12次方等于68719476736。