The volume of the cone is 56.52 cubic centimeter, and the height is 6 centimeter

56.52/6=9.42
9.42*3=28.26
28.26/3.14=9
So R ^ 2 = 9, r = 3
Perimeter = 3 * 2 * 3.14 = 18.84

It is known that the volume of a cone is 56.52 cubic centimeters and the radius is 3 centimeters. The height of a cylinder is calculated

The height of the cylinder
=56.52/（3.14*3*3/3）、
=56.52/9.42、
=6 cm

A. B two cars leave from station a and station B at the same time. For the first time, the two cars meet 32 kilometers away from station A. after meeting, the two cars continue to drive. After arriving at station B and station a respectively, they immediately return along the original road. For the second time, they meet 64 kilometers away from station A. so how many kilometers are there between station a and station B?

(32 × 3 + 64) △ 2 = (96 + 64) △ 2 = 160 △ 2 = 80 (km) a: the distance between station a and station B is 80 km

It is known that in the plane quadrilateral ABCD, AB + CD

It is proved that: ∵ AB + CD ≤ AC + CD
∴AB≤AC

【1】 Canteen shipped 4 / 5 tons of coal, burning some of the remaining 1 / 5, how many tons are left. Fast, thank you, urgent
【2】 The canteen transported 4 / 5 tons of coal, burned 1 / 4, how many tons are left. [3] the canteen transported 4 / 5 tons of coal, burned 2 / 5, burned 1 / 4, how many tons are left. [4] the canteen transported 4 / 5 tons of coal, burned 2 / 5, burned the remaining 1 / 4, how many tons are left. [5] the canteen transported 4 / 5 tons of coal, burned 2 / 5, burned the remaining 1 / 4, how many tons are left, The ton burned is one fourth of that left. How many tons are left

1. 4 / 5-5 / 4 * 1 / 5 the answer is 16 out of 25
2 4 / 5 * (1-1 / 4) the answer is three fifths
3 (1-2 / 5) * 4 / 5-1 / 4 the answer is 23 out of 100
4. It burned (4 / 5-2 / 5) 1 / 4 again, and there were 4 / 5-2 / 5-1 / 10 left
5, let x tons remain, x + 1 / 4x = 4 / 5, the answer is 1

Why can you use mean inequality? Please prove it
Inverse use mean inequality to get the maximum, wrong type, I mean 2, 3

Landlord, I know what you mean. Let me tell you, the mean inequality actually gives the upper limit of the value range of an equation, but there are certain restrictions on whether the upper limit can be obtained. Generally speaking, when using the mean inequality to find the maximum value, then there must be little control over variables in this problem, even if there are

A batch of goods was distributed to Party A and Party B at a ratio of 5:3. Party a completed 45% of its task, and the rest was transported to Party B. Party B transported a total of 48 tons. How many tons are there in total?

Suppose that there are x tons of goods in total, then the task of team a is 58x tons, and that of team B is 38x tons. The unfinished task of team a is 58x × (1-45) tons. According to the meaning of the question, we can get the equation: 58x × (1-45) + 38x = 48. Solving this equation, we can get x = 96. A: there are 96 tons of goods in total

A problem of mathematical inequality in grade one of senior high school
Given a > 0, b > 0, C > 0, cut a + B + C = 1, prove: (1 / A-1) (1 / B-1) (1 / C-1) ≥ 8

（1/a-1）（1/b-1）（1/c-1）
=（1/a-a/a）（1/b-b/b）（1/c-c/c）
=(1-a)(1-b)(1-c)/abc
=(b+c)(a+c)(a+b)/abc
≥2√bc2√ac2√ab/abc
=8

For a section of road, it takes 1 / 2 hour for a bus to complete the whole journey and 20 minutes for a car to complete the whole journey. The speed ratio of a bus to a car is (:)
There are 600 students in Xingzhi Primary School. One day, the attendance rate of the school is 98.5%. How many students in Xingzhi Primary School ask for leave and don't come to school?

Two to three, two to three

Given that the minimum value of quadratic function y = x ^ 2lga + 2x + 4lga is - 3, find the value of real number a

For convenience, let LGA = t
y=tx^2+2x+4t
When x = - 1 / T, y is the smallest
Then y = - 1 / T + 4T = - 3
That is: 4T ^ 2 + 3t-1 = 0
(4t-1)(t+1)=0
T = 1 / 4 or T = - 1
And because of T

The volume of the cone is 56.52 cubic centimeter, and the height is 6 centimeter