If trees are planted at both ends of the road, it is: 50÷ 1+ 1=5 1.

If there is only one tree at both ends of the road, it is: 50÷ 1=50 trees.

If no trees are planted at both ends of the road, it is: 50÷ 1- 1=49 trees.

What you said about "52 trees turned out" is a lie. Don't believe the so-called "reference answer".