The circumference of the bottom surface of a cone is 62.8 decimeters, and its height is 1.5 times of its diameter. How many cubic decimeters is the volume of this cone?

Bottom radius 62.8 ÷ (2x3.14) = 10dm
Height 10x2x1.5 = 30dm
Volume 1 / 3 x 10 x 3.14 x 30 = 3140 cubic decimeter
A: the volume is 3140 cubic decimeters

How many cubic decimeters is the volume of the largest cone cut from a cylinder with a bottom circumference of 31.4 decimeters and a height of 8 decimeters?

What is the radius of the bottom
31.4 △ 3.14 △ 2 = 5 (decimeter)
What is the volume of a cone
5 × 5 × 3.14 × 8 × 1 / 3 ≈ 209.33 (cubic decimeter)

The solution set of LX + 3l-lx-2l greater than or equal to 3?

Discussion according to the situation:
① When x ≤ - 3, LX + 3l-lx-2l = - (x + 3) + (X-2) = - 5,
Then the inequality becomes - 5 ≥ 3, which is not tenable;
② Dang-3

Dahua supermarket has a new beverage on sale. It costs 15 yuan for three bottles. These days, we are promoting sales. How much does it cost for each of 35 students in class 4 (3)?

If the operation process of the new symbol * is a * b = 1A / 2-1B / 3, then the equation 2 * (2 * x) 1 * x is solved
It's due on Monday. The operation process of the new operation symbol * is a * b = 1A / 2-1B / 3. Then solve the equation 2 * (2 * x) = 1 * X. Wrong number just now

a*b=1/2a-1/3b
2*（2*x)=1*x
2*(1-1/3x)=1/2-1/3x
1-1/3(1-1/3x)=1/2-1/3x
1-1/3+1/9x=1/2-1/3x
1/9x+1/3x=1/2-1+1/3
4/9x=-1/6
4x=-3/2
x=-3/8
B of a is expressed as B / A

It takes 10 hours for a bus and 15 hours for a freight car to go from a to B. now the two cars leave each other from two places. When they meet, the bus runs 240 kilometers. How many kilometers are there between a and B?

A: the distance between a and B is 400 km

What's 5 out of 8 plus 5 out of 8?

5 out of 8 + 5 out of 8
=10 out of 8
=5 / 4

Car a and B are running from a and B. car a starts 15 minutes earlier than car B. the speed of car a and B is 2:3. When they meet, car a runs 6 kilometers less than car B, and it's already running

The distance is 6930

Solving equation 5:2x + 3:1 = 9:4

2X of 5 + 1 of 3 = 4 of 9
2x/5 = 4/9 - 1/3
2x/5 = 1/9
x = 5/18
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Given a * 1 / 5 = 3 * b = C * 1 / C, what are a and B respectively? A + B = how many? A-B = how many. A * b = how many

The original formula is a / 5 = 3B = C / C = 1, so a = 5, B = 1 / 3, so a + B = 16 / 3, A-B = 14 / 3, ab = 5 / 3

The circumference of the bottom surface of a cone is 62.8 decimeters, and its height is 1.5 times of its diameter. How many cubic decimeters is the volume of this cone?