2^x = 1677215? , 2^x = 4294967295?

2^x = 1677215
log(2^x)=log(1677215) (左右加上log)
x log(2)=log(1677215) (恆等式:log(a^b)=b*log a)
x=log(1677215)/log(2)
(用計算機:例如:1677215之後按log計算log(1677215))
=20.677...


2^x=4294967295
log(2^x)=log(4294967295)
x log2=log(4294967295)
x=log(4292967295)/log2
x=32

2^x = 1677215
log2^x = log1677215
x log2 = log1677215
0.301 x = 6.2245
x = 6.2245 / 0.301
x = 20.7

2^x = 4294967295一樣方法, 自己做