Puzzles/Arithmetical puzzles/Logarithms Puzzle
Task is using any arithmetical operators, and school functions, such as logarithms, trigonometrical functions, square roots, and set of digits, get a specific digit.
That means using "1" seven times write 10000, and the solution is:
Logarithms Puzzle 1
Logarithms Puzzle 2
Logarithms Puzzle 3
Since it may be difficult to solve, try solving these first: