Math 24 - Mathematical expert

"Math 24" is a mathematical app,it is very interesting like chess,and it has its unique mathematics charm，so more and more people like it. This game is easy to learn, brain puzzle.

Rules of the "Math 24" are as follows: randomly selected 4 number from1 to 10(may repeat),and use addition, subtraction, multiplication, division or parentheses to calculate result which is equal to 24,each number must be used once and only once.