2、 12.5%= =2:( 16 )=( 4 )÷32=6 ÷( 56 )
3. Common statistical charts are (broken line statistical chart), (bar statistical chart) and (fan statistical chart). To show the number of graduates of a school in each year, you can choose a statistical chart (broken line statistical chart).
4. Write down four numbers from the factor of 12: (1:3=4: 12).
6. Put 7 red pencils and 3 blue pencils in a bag so that you can touch 1 pencil at a time. If you touch it 20 times, the red pencil accounts for about 14 of the total number of times.
7. At present, there are 8 cubic gifts with a side length of 1 decimeter. Pack these gifts together, with wrapping paper of 24 square decimeters at most.
8. A cylindrical container contains 14. 13 liters of water. Put an iron cone with the same height as its bottom into the water, and there are (42, 39) liters of water in the container.
9. Cut a cube with 6 sides painted red and 5 cm long into cubes of 1 cm, which can be cut into (125) pieces, of which only 1 side is painted red and there are (54) pieces.
Three. Select (write the serial number of the correct answer in brackets) (8 points)
1, put 25 grams of salt into 200 grams of water and melt it into brine, then the weight ratio of salt to brine is (B )A, 1: 8 b, 1: 9 c, 1: 10.
2. The ratio of degrees of three internal angles of a triangle is 1: 1: 2, which is a triangle (A).
A, right angle b, obtuse angle c, isosceles