计算24点主要应用四种运算。开始状态有四个操作数，一个运算符对应两个操作数，所以一开始选择两个操作数分别对四个操作符进行循环检测，每一次运算后产生了新的数，两个数运算变成一个数，整体是少了一个操作数，所以四个数最终是三次运算。-Calculation of 24 operations in four major applications. There are four status beginning operand, an operator corresponding to two operands, so select one start operation respectively on the two operators to carry out the cycle of four tests after each operation the number of new, changed both the number of computing into a number of the overall operation are a few less, so the final four are three times the number of computing.