an hypotenuse (math.) be tantamount to x (a>0, and a not be tantamount to 1), then Number n is called base ax logarithms (logarithm), denote n=logax. Where a is called logarithms Base, x is called true number, and n is called "x logarithms at the base of a."

In b=lgN, the Number of objections is known to find the corresponding true number N for number b, and 10^b=N, so N=lg-1b=10^b, directly Calculator 10^b.

Remove the redundant part of expression 4 + 1/(2 + 1/(6 + 1/7)) to receive the token [4; 2, 6, 7].