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Find the answers to two math problems
1, 57× 4 ÷ (97+94+96+93) = 0.6m, which is 60 cm.

2. Six trees have five intervals, each interval is 15m÷5=3m, 15 trees have 14 intervals, and the interval is 14×3m=42m.

Finally, the total distance is 42m, the spacing number is 42÷2=2 1, and the number of trees is 2 1+ 1=22.