找规律,下面的代数式是：2+2^2+2^3+…+2^98+2^99

m^6
m-1
m^n-1
2+2^2+2^3+…+2^98+2^99
=(2-1)(1+2+2^2+2^3+…+2^98+2^99)-(2-1)
=2^100-1-(2-1)
=2^100-2