(1) The problem of planting trees on unclosed lines can be mainly divided into the following three situations:

(1) If you want to plant trees at both ends of the unclosed line, then:

Plant number = number of nodes+1 = total length ÷ plant spacing-1 total length = plant spacing × (plant number-1) plant spacing = total length ÷ (plant number-1)

(2) If you want to plant trees at one end of the non-closed line and not at the other end, then:

Number of plants = number of segments = total length/plant spacing = plant spacing × plant number = total length/plant number

(3) If trees are not planted at both ends of the non-closed line, then:

Number of plants = number of nodes-1 = total length ÷ plant spacing-1 total length = plant spacing × (number of plants+1) plant spacing = total length ÷ (number of plants+1)

(2) The quantitative relationship of tree planting on the closed loop is as follows:

Number of plants = number of segments = total length/plant spacing = plant spacing × plant number = total length/plant number