The ratio of 5,8,15 and 24 is 8 / 5: (): () = (): ()

The ratio of 5,8,15 and 24 is 8 / 5: (): () = (): ()

5：8=15:24

Among the five numbers 2,5,8,16,10, the ratio of four numbers is ()

Is it an equal proportion?
5:10=8:16
5:8=10:16

Among the five numbers 0-4, choose four to make up four digits with factors of 2, 3 and 5 And order them

At the same time, a four digit number with a factor of 2, 3, 5 must be an integral multiple of 30, the least common multiple of 2, 3, 5,
So the last bit is 0, and the sum of the other three numbers is an integral multiple of 3
So the other three numbers are 1, 2, 3 or 2, 3, 4
From small to large, it is 12301302130231203210234024303203420
42304320, 12 in total

4. In 6, 9, 15, 10 five numbers, can form the proportion of () What's in the brackets

4:6=10:15=6:9

1. Cut a cylindrical wood block with a diameter of 4cm and a height of 3cm, and divide it into two cylindrical blocks with the same size and shape, and increase the surface area by () square centimeter 2. A cylinder with a base radius of 2 decimeters, a height of 6 decimeters, a surface area of (), and a volume of () 3. Enlarge the radius of the bottom of a cone to twice of its original height, enlarge its base area to () times and its volume to () times 4. The ratio of 1 / 2,12,1 / 3,8 is () 5. The unit price is fixed, the total price is in proportion to the quantity; the driving distance is fixed, and the driving speed is in proportion to the time used

1. A cylinder with a diameter of 4cm and a height of 3cm is cut into two cylindrical blocks with the same size and shape. The surface area of the block increases by (2 × π × 2? 2 = 8 π) square centimeter

The ratio of 1 / 2,1 / 3,8,12 can be written as

because
1/2×8=1/3×12
therefore
1/2:1/3=12:8
1/3:1/2=8:12
1/2:12=1/3:8
12:1/2=8:1/3

Use 4, 8, 5, 10 to make up eight proportions

4:8=5:10
8:4=10:5
4:5=8:10
5:4=10:8
8:4=10:5
4:8=5:10
5:4=10:8
4:5=8:10
If there is anything you don't understand, you can ask,

The four numbers of 2 / 3, 5 / 6, 3 / 8 and 3 / 10 are divided into eight different proportions

2/3:5/6=3/10:3/8
5/6:2/3=3/8:3/10
2/3:3/10=5/6:3/8
3/10:2/3=3/8:2/3
3/10:3/8=2/3:5/6
3/8:3/10=5/6:2/3
5/6:3/8=2/3:3/10
3/8:2/3=3/10:2/3

1. There are () tens and () ones in 67; the number composed of eight ones and four tens is ()

There are (6) tens and (7) ones in 67; the number of eight ones and four tens is (48)

The four numbers 2, 4, 5 and 10 can be used to form up to 8 different proportional formulas. What are there?

8 different proportions are as follows:
2:4=5:10,4:2=10:5,10:5=4:2,5:10=2:4,
2:5=4:10,5:2=10:4,4:10=2:5,10:4=5:2