Acrobats perform unicycle walking steel wire, the diameter of the wheel is 40 cm, to ride 50 m long steel wire, the wheel about how many cycles?

Acrobats perform unicycle walking steel wire, the diameter of the wheel is 40 cm, to ride 50 m long steel wire, the wheel about how many cycles?

3.14 × 40 = 125.6 (CM), 125.6 cm = 1.256 m, 50 ／ 1.256 ≈ 40 (cycles); answer: the wheel should roll over 40 cycles

A mouse runs away along the direction of parallelogram a-b-c-d. at the same time, a cat starts from point a, pursues the mouse along the direction of a-d-c-b, and catches the mouse at point e. the speed ratio of the mouse to the cat is 11:14, and the CE length is 6 meters
(AB is the top and bottom of the parallelogram, DC is the bottom of the parallelogram, ad is the hypotenuse on the left side of the parallelogram, BC is the hypotenuse on the right side of the parallelogram, be is half of BC.)

Super simple
6 * 2 / (14-11) * (14 + 11) = 100m
The method used is to divide the distance difference by the speed difference equal to time, and then multiply the time by the speed sum to get the total distance
You can come by the cube, too
Let half of the circumference be X
（X-6）/11=（X+6）/14
The solution is x = 50
The perimeter is 50 * 2 = 100 meters

A car runs 210 kilometers in 3 hours. At this speed, it takes 5 hours to travel from a to B. what is the distance between a and B?

The distance between a and B is x km. According to a certain speed, the distance is in direct proportion to the time
x：210 = 5：3
X = 210 × 5 △ 3 = 350 km

If the solution of the equation x-2m-3 = 3x + 7 is not less than 2 and not more than 10, there is a solution set for M

-2m-3-7=2x
x=-m-5
2≤x≤10
2≤-m-5≤10
2+5≤-m≤10+5
7≤-m≤15
-15≤m≤-7

From the first hour to the second hour, the first hour is 1 / 5 of the whole journey. The second hour is 80 kilometers, and the first hour is 25% more than the second hour

80x (1 + 25%) in the first hour = 100km
100 △ 1 / 5 = 500m

Given the set a = {- 1,1,3} B = {(√ a) + 2, a}, and B is contained in and equal to the value of A
I know how to count,

a≥0；
(1) A = 1; √ a + 2 = 3;
(2) A = 3; √ a + 2 = 2 + √ 3; inconformity;
∴a=1;
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If a = the square of X + 5x + 4, can you factorize the polynomial (x ^ 2 + 5x + 4) (x ^ 2 + 5x + 6) + 1 by substitution?

Original formula = a * (a + 2) + 1 = a ^ 2 + 2A + 1 = (a + 1) ^ 2 = (x ^ 2 + 5x + 5) ^ 2

In the fruit shop, there are 820 kg bananas, apples and oranges, of which bananas weigh a quarter more than apples, oranges weigh 20 kg less than bananas, and oranges weigh 20 kg less
There are formulas

&#If the apple is x kg, the banana is x + 1 / 4x kg, that is, 5 / 4x kg
x+5/4x+（5/4x-20）=820
We get x = 240
So you can put in (5 / 4x-20) and get 280 kg of oranges

Is the third of X + Y-Z plus y minus z a monomial or a polynomial_____ three

Polynomials

The more the better
Do not copy the previous one

1g/cm³=1*10³kg/m³
1g/cm³=1kg/dm³
1m³=1000dm³
1dm³=1000cm³
1mL=1cm³
1L=1dm³