Current location - Training Enrollment Network - Mathematics courses - The title of 2.3.4.5.6 on page 120 in the second volume of fifth grade mathematics of People's Education Press.
The title of 2.3.4.5.6 on page 120 in the second volume of fifth grade mathematics of People's Education Press.
2. Li Ming encircles a triangle with a 1m long iron wire. Have you ever measured that one side of a triangle is 1/4, the other side is 3/8m, and how long is the third side? It is a 1- 1/4-3/8.

=8/8-2/8-3/8

= 3/8m

This triangle is an isosceles triangle.

3.? Class 5 (1) students spent 10 hours visiting the old revolutionary base areas, of which15 was spent on the road, 3/ 10 was spent on lunch and rest, and the rest was sightseeing time. What's the percentage of sightseeing time?

1- 1/5-3/ 10

= 10/ 10-2/ 10-3/ 10

= 1/2

4. The land area of China is divided by altitude as follows (unit: meter).

Below 500 500~ 1000? 1000 ~ more than 2000? More than 2000 ~5000? More than 5000

Low hills and plains? Low mountains and hills, high mountains? Alpine high plains? Alpine region

4/25? 19/ 1007/25? 9/50 19/ 100

(1) Altitude 100m and 100m? What is the following area * * *?

(2) The area above100m is occupied by * * * *.

How much/how much? (3) What questions can I ask? Answer your question.

5. Fill in the appropriate operation symbols in ○.

2/3○3/ 14=3/ 14+2/3? 1/2+4/7+3/7= 1/2+(4/7○3/7)

6.

draw