3^x = 27 ,即 x = 3
2^y = 16 ,即 y = 4
所以 x+y = 3+4 = 7初一拓展题 需要推算的过程3^1 = 33^2 = 93^3 = 27 所以 x = 32^1 = 22^2 = 42^3 = 82^4 = 16 所以 y = 4所以 x + y = 7