Help! Do math problems! Good plus 50 points 5

1) A and b are coprime numbers, and their greatest common factor is.

1), the least common multiple is (ab). For example, the greatest common factor of (2) and (3) is (1), and the least common multiple is (6).

2) A is divisible by b (a is a multiple of b), these two.

The greatest common factor of the number is (a) and the least common multiple is (b).

For example, the greatest common factor for (2) and (6) is (2), and the least common multiple is (6).

3) The least common multiple of 12,60,8 is (120).

4) a=2 3 5 b=2 2 5 with b

The greatest common factor is (10) and the least common multiple is (420).

2. Find the greatest common factor and the least common multiple of the following groups.

12 and 21 90 and 36 18 and 42 (vertical) maximum: 3; 18；6

Minimum: 84; 180；126

35 and 7 12 and 7 36 and 54

3. Fill in the appropriate scores.

48 minutes = 80 seconds at (4 5) = (4 3) minutes 250kg = (1 4) t

25 square decimeters = (1 4) square meters 125ml = (1 8) l2400 cubic centimeters = (cubic decimeters.

5. Build a New Century Primary School building on a piece of land covering an area of 3,600 square meters. Among them, the teaching building occupies two-fifths, the playground occupies one-quarter, and the green land occupies two-ninth. Can you figure out how many square meters each of them occupies?

1)1 ab 3 7 1 21

2)b a 8 4 4 8

12 and 21 common factors 3 common multiples of 84

90 and 36 18 180

18 and 42 6 126

35 and 7 7 35

12 and 7 1 84

36 and 54 9 216

Hour one and a third of a minute.

square meters l cubic decimeters.

Each occupies an area of 1440 900 800

What's the use of asking someone else to do it for you?

Is learning also to help others?

I can tell you that the condition is to make mine first.

The rational number is an approximation of this quantity. About 100 million yuan is an approximate number, and 12 is an exact number.

Accurate to the single digit is 3, accurate to the percentile is, accurate to the rounding method, accurate to, accurate to the result of the rounding approximation is.

backpack is （on the desk）.Ask questions about section ( ). where is his backpack?

book is on the chair .Rephrase the sentence by replacing a with four. four books are on the chair.

Significant figures: From the first non-zero number to the left of a number to the last number, all numbers are significant digits of the number.

Since the absolute values are both non-negative, the sum of the two absolute values is equal to 0, which means that both absolute values are 0, so a=-1 and b=1

The absolute value of 1-a is a-1, and the absolute value of 3-a is 3-a, so the sum of the sum of 2 is likely to be 8, possibly -8, possibly 2, possibly -2, possibly 2, possibly 8

Cylinders and cones of equal height with equal bottom, the volume of the cylinder is 3 times that of the cone, and the volume of the cone is 16 (3-1) = 8 cubic meters.

The volume of the cylinder is 8 3 = 24 cubic meters.

The volume of the cone is 96 (3+1)=24 cubic decimeters, and the volume of the cylinder is 24 3=72 cubic decimeters.

Let the volume of the cylinder be x, then the volume of the cone is 1 3x, so x-1 3x=16

The solution is x=24

So the cone volume is 24 1 3 = 8 (cubic meters).

Answer: The volume of the cylinder is 24 cubic meters, the volume of the cone is 8 cubic meters, and the volume of the cone, which is 1/3 of the volume of the cylinder

The volume of the cylinder is.

96 (1 1/3) 72 (cubic decimeter).

The volume of the cone is.

72 1/3 24 (cubic decimeter).

Hope it helps.

The difference in volume between the cylinder and the cone of equal height is 16 cubic meters.

Volume of the cylinder = r 2h

Volume of the cone = (1 3) r 2h

The difference in volume between the cylinder and the cone of equal height is 16 cubic meters.

r 2h- (1 3) r 2h = 16 volume of a cylinder = r 2h = 24 cubic meters of volume of a cone = (1 3) r 2h = 8 cubic meters of equal height of a cylinder and a cone of equal height is 96 cubic decimeters r 2h + (1 3) r 2h = 96 volume of a cylinder = r 2h = 72 cubic meters of volume of a cone = (1 3) r 2h = 24 cubic meters.

Cylindrical volume = sh

Cone volume = 1 3sh

The difference between these two volumes is 16 cubic meters, indicating that SH-1 3SH=2 3SH=16 SH=24m was checked

So the cone is 1 3sh = 24 3 = 8m

The sum of the volumes is 1 3sh sh = 96m 4 3sh = 96 sh = 72m

So the cone is 72 3 = 24m