设丢番图活了x岁,
那么 1/6x + 1/7x + 5 +1/2x + 11 = x
7/42x + 6/42x + 21/42 + 16 = x
x - 34/42x = 16
8/42x = 16
x = 84 答:他活了84岁
2、84/6 + 84/12 + 84/7 + 5=38 丢番图开始当爸爸时的年龄38
3) 84-4=80 儿子死时丢番图的年龄80
设丢番图活了x岁,
那么 1/6x + 1/7x + 5 +1/2x + 11 = x
7/42x + 6/42x + 21/42 + 16 = x
x - 34/42x = 16
8/42x = 16
x = 84 答:他活了84岁
2、84/6 + 84/12 + 84/7 + 5=38 丢番图开始当爸爸时的年龄38
3) 84-4=80 儿子死时丢番图的年龄80