7 o clock? Minutes, the minute hand is 100 degrees behind the hour hand. 1 1 5 1 5 9 1 9 13 1 13 17

7:20 a.m.

A: A clock is circular, 360 degrees. It is divided into 12 points, so the distance between the points is 30 degrees.

When the minute hand is 100 degrees behind the hour hand and the hour hand is at 7 o'clock, then the minute hand is in the distance between the three points and the dots, i.e. at 3 o'clock and 4 o'clock (since the distance between the three dots is 90 degrees, then it must be in the interval between the dots and the 4 o'clock). This leaves 100 degrees - 90 degrees = 10 degrees. The distance between the dots is 30 degrees, so every minute is 30 60 degrees, that is, degrees.

3 o'clock to 4 o'clock, i.e. 15 minutes to 20 minutes. 10 degrees = 20 minutes multiplied by degrees. So the minute hand was exactly 20 minutes at that time.

The result was 7:20 a.m.

1.Analysis: The clock face is divided into 12 large cells and 60 small cells, each large cell is 360 divided by 12 = 30 degrees, each small cell is 360 divided by 60 = 6 degrees, the hour hand is only 30 degrees in an hour, so every minute the hour hand moves 1 60 * 30 = 1 2 degrees.

In this problem, it is to find the minute hand behind the hour hand, that is, when the hour hand is between 7 and 8, the minute hand cannot exceed the point of 7, so it is necessary to calculate how many small squares the minute hand is still from the node of 7, multiply by 6, and you can know the degree.

Set 7 o'clock x minute, the minute hand is 100 degrees behind the hour hand.

x/60)*30+6(35-x)=100

Solution x=20

At 7 o'clock, the minute hand is 100° behind the hour

At 7 o'clock sharp, the minute hand is 100 degrees behind the hour hand: 360 12 7 210 degrees, assuming that the minute hand is 100 degrees behind the hour hand after x minutes or hidden clocks.

It takes 60 minutes to walk a circle in 60 minutes is 360 degrees, and the hour hand takes 6 degrees to walk 1 12 times in 60 minutes to walk 30 degrees, and the minute hand is 100 degrees behind the hour hand at 7:20 at 7:20.

30° 3=90°, that is, from 7:15 to 7:30, the minute hand rotates 90° clockwise;

So the answer is: 90

The minute hand walks 6 ° in 1 minute, the hour hand walks in 1 minute, and 7 o'clock is like a big omen, and the angle between the slag rental needle and the hour hand is 210 °.

In the clockwise direction, at 7 o'clock x minute, the angle between the hour and minute hands is 100°.

The minute hand is behind the hour hand, and there is.

210°-6°x+

x = 20 so the answer is 7:20.

7. The angle between the hour and minute hands (major angles) is 210 degrees.

The minute hand turns in one minute: 360 60 = 6 degrees.

The hour hand turns in one minute: 30 60 = degrees.

20 minutes. A: The clock is at 7:20 and the minute hand is 100 degrees behind the hour hand.

(360° 12 7-100°) 360° 60-360° 12 60) = 110°, at 7:20, the minute hand is 100 degrees behind the hour hand.

360÷12x7=210°

Set x minutes. x=20

A: 100° behind at 7:20

First of all, at 7 o'clock, the minute hand is 210 degrees different from the hour hand 210-100 = 110 (degrees) 110 degrees is the distance between the minute hand and the hour hand. The minute hand travels 6 degrees per minute, and the hour hand travels 1 2 degrees per minute, with 110 (6-1 2) = 20 (minutes).

At 7 o'clock, the minute hand is 210 degrees behind the hour hand.

The minute hand turns in one minute: 360 60 = 6 degrees.

The hour hand turns in one minute: 30 60 = degrees.

20 minutes. A: The clock is at 7:20 and the minute hand is 100 degrees behind the hour hand.

Solution: At 7 o'clock, the minute hand is 100 degrees behind the hour hand: 360 12 7 210 degrees, assuming that x minutes have passed.

Walking a circle in 60 minutes is 360 degrees, walking 6 degrees in 60 minutes, walking 1 in 60 minutes and walking 12 times is 30 degrees, and walking degrees in every minute x = 20

Solution: At 7 o'clock, the minute hand lags behind the hour hand: 360 12 7 210 degrees 210-100 = 110 (degrees).

110 degrees is the distance between the minute hand and the hour hand.

The minute hand goes around in 60 minutes and is 360 degrees, 6 degrees per minute, and the hour hand travels 1 2 degrees per minute, with 110 (6-1 2) = 20 (minutes).