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The large is explained for the small trumpet, or explained for a friend, it is all 300 taels of silver here

A sucker. A sucker.

A sucker. A sucker.

A sucker. A sucker.

A sucker. He's playing tricks and earning clicks.

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Blog visits: 542.

The above is my analysis, the position of point A has not changed, the meaning of the title is to re-select the O point, so that the newly obtained 3 is the position of the original -3, draw it is this diagram, you see right, from the diagram, move the new origin to the right 6 units is the original origin, the above answers are not wrong, but it is not easy for beginners to understand, I hope yours can help you.

He spoke of a number line, which was -3 at point A. Then the opposite position of -3 is positive 3, then he should move 6 units to the left along the number axis if he wants to draw the figure correctly. It's -3That's right. I hope you will take my answer.

If the position of point A does not change, the origin should be moved 6 units in the positive direction to change the current point of A from positive 3 to negative 3.

Solution: 1, this is a decreasing function, tolerance d=, a1=105 cut the length of the rope is d(n-1)=, take n=8The length of the cut is 105-d(n-1), take n=8, the remaining length is 2, buy b hamburger than b bread and spend b* (

Substituting a=,b=5 into the above equation, the result is:

1.A and B rode bicycles from A and B, which are 20 kilometers apart, and met each other in four-fifths of an hour. It is known that A rides at 15 kilometers per hour, how many kilometers per hour does B ride a bicycle?

The speed of 10B is 10 kilometers per hour.

2.A road repair team repaired 520 fewer roads in the first week than in the second week, and the first week repaired two-fifteenths of the second week.

The team built a total of 680 meters of road in two weeks.

3.The original price of a commodity is 400 yuan, the price of the first half of the month increased by one-fifth, and the price of the next month is reduced by one-quarter, how much is the current price of this commodity?

The current price of this item is 360 yuan.

4.In the first seven months of last year, the paper mill completed three-quarters of the annual task, producing another 1,600 tons, which can overproduce 400 tons, how many tons of paper were planned to be made last year?

Last year, it planned to make 4,800 tons of paper.

B + C + D: 26x3 = 78 (kg).

B + C: 78-28 = 50 (kg).

A + B + C: 24x3 = 72 (kg).

A: 72-50 = 22 (kg).

The three teams of A, B and C take a total of 3*24=72

The three teams of B, C and D collect a total of 3*26=78

Team D has 78-72=6 more than Team A

Team A takes 28-6 = 22 kg.

1.Former Male Former Female = 23 27, Former Male = Former Male + 2, Current Female = Former Female -2. Current female = 1 2 current class size, i.e.:

Female = male. Therefore, the original male + 2 = the original female - 2, know: the original male = the original female - 4.

According to the original male original female = 23 27, it is known that the original female - 4 the original female = 23 27, so the original female = 27. So the original male = 23, and the total number of people in the original class = original male + original female = 50.

2.Raw salt Raw water = 20% 80% = 1 4, present water = raw water + 100, present salt = raw salt. Present salt Present water = 10% 90% = 1 9.

That is: raw salt (raw water + 100) = 1 9, combined with raw salt raw water = 20% 80% = 1 4 know: raw water = 4 raw salt, so raw salt (4 raw salt + 100) = 1 9, so raw salt = 20 kg, raw water = 80 kg, so the derived brine is 100 kg.

750 meters = kilometers.

489 grams = kilograms.

5 kg = ton.

Kilometers = 7060 meters.

5 jiao 3 points = yuan.

1275 grams = kilograms.

8 tons 50 kg = tons.

m = 7 m 8 dm.

The detailed process was filmed, and it was just written as it was.

Help me adopt it, thank you!

The area of a known circle = radius radius.

That is, it is obtained: the area of the circle = the length of the side The length of the side.

Because the length of the side = the area of the square = 10 square centimeters.

So the area of the circle = square centimeters)