Solution: Let the tree be x meters high, according to the meaning of the question.

1÷0.9=(X- 1.2)÷2.7

Get a solution

X=4.2

This tree is 4.2 meters high.

Solution: let the tree height be x.

According to the meaning of the question, the shadow length of the tree is 2. 7+ 1。 2 = 3.9 meters

1 cm = 0.0 1 m

Then it is 0.01:0.9 = x; 3.9

The solution is X=0.043.

The height of this tree is 0. 043m。

Solution: Just use the proportional method.

0.0 1:0.9=x:2.7

The solution is X=0.03.

0.03+ 1.2= 1.23 (m)

A: The height of the tree is1.23m.