有些题目,某些条件并没有给出,但解题时又是必需的,我们可以把这些必需的数量先设出来,再利用这个设出的数量解题,但不求出它的具体值。这种解题方法叫做增元法。【例1】孙悟空给三群猴子分桃子。如果只分给第一群,则每只猴子可得12只;如果只分给第二群,则每只猴子可得15只;如果只分给第三群,则每只猴子可得 Some questions, some of the conditions are not given, but the problem is necessary, we can put these necessary first set out, and then use the set number to solve the problem, but do not find its specific value. This problem-solving method is called incremental method. [Example 1] Monkey King points to three groups of monkeys divided peaches. If you only give the first group, each monkey can get 12; if only assigned to the second group, each monkey can get 15; if only assigned to the third group, each monkey available