How many people are there in PE class? How many people are there in PE class

In fact, the original question can be changed into: six (1) class students in physical education, row into three lines less than one person, row into four lines less than one person, row into five lines less than one person, row into six lines less than one person?
The result is to find the least common multiple of 3,4,5,6 and subtract 1, (3,4,5,6) = 60,60-1 = 59 people

In the 100 meter race, Xiaoming took 14 seconds and Xiaojie 16 seconds, so the speed ratio between Xiaoming and Xiaojie is 1____ . kneel down

Distance divided by time is equal to speed. Divide 100m by their time respectively. Divide the figures to get the speed ratio

The speed of Xiaoming is 220 meters per minute and that of Xiaojie is 300 meters per minute. Xiaoming is 100 meters in front of Xiaojie at the start
How many minutes after the first meeting? Q2: how many minutes after the second meeting? Q3: how many minutes after the third meeting, when they were 20 meters apart?

1.
100 ÷ (300-220) = 1.25 minutes
two
The second time:
(100 + 400) / (300-220) = 6.25 minutes
three
(100 + 400 + 400-20) / (300-220) = 11 minutes

Solve the equation, the square of X_ 6x_ 2＝0

x^2 - 6x -2 =0
(x-3)^2 = 11
X-3 = 11 square root or x-3 = - (11 square root)
X = 3 + (11 square root) x = 3 - (11 square root)

How to solve the equation with the square of 6x - 40 = 0?
6X square - 40 = 0 exercises of junior three.. I was promoted to junior three this year. I want to study by myself

6X^2-40=0
6X^2=40
X^2=20/3
So x = plus minus root 20 / 3

When someone goes out shopping at more than 6:00 in the afternoon, he looks at the angle between the hour hand and the minute hand on his watch, which is 110 degrees. When he comes home at nearly 7:00 in the afternoon, he finds that the angle between the hour hand and the minute hand is 110 degrees again. How long has he been out?

Suppose the hour hand goes x ° from someone's going out to his home, then the minute hand goes (2 × 110 ° + X °). From the meaning of the question, we get 220 ° + X ° 360 ° = x ° 30 ° and the solution is x = 20 ° because the hour hand goes 30 ° every hour Method 2: the minute hand goes one minute and six degrees, that is, the angular velocity of the minute hand is 6 degrees per minute, and that of the hour hand is 0.5 degrees per minute, that is, the angular velocity is 0.5 degrees per minute. At the beginning, the minute hand is 110 degrees behind the hour hand, and then the minute hand is 110 degrees in front of the hour hand. This is a catch-up problem That is, 40 minutes out

Given that the square of x-xy = 5, the square of xy-y = - 3, find the sum of the squares of the algebraic formula x-2xy + y

(X^2-XY)-(XY-Y^2)=X^2-2XY+Y^2=5-(-3)=8
You can get the result by subtracting the known two formulas~

How many people are there in PE class? How many people are there in PE class