A simple math problem will help! Help!

Answer: According to the question, let the time be x, y, z, then x+y+z=10, 6x+4y+5z=49, and then express one of the unknowns with the remaining two, for example, x, y represents z, that is, z=10-x-y, substitute the second equation, turn it into a one-time function about x, y, make an image, trace integer points, and the result satisfies the conditions as follows: x=1,2,,y=2,3,4,5,z=7,5,3,3,1

The three numbers correspond one to one. That's it.

Solution: Let the time of the three journeys be x, y, and z respectively

Question: 6x+4y+5z=49

x+y+z=10

x, y, and z are all integers.

then x=2, y=5, z=3

It took 4 hours from A to B, 5 hours from B to C, and 1 hour from C to D.

There are several sets of answers to this question.

First of all, the time taken for the 3 sections of the road is obtained by the simultaneous equation of x y z.

x+y+z=10

6x+4y=5z=49

x y z is an integer.

The answer that can be derived from all three conditions is correct.

Your question boils down to:

a+b+c=10

6a+4b+5c=49

a, b, c are not 0

Find the solution of the ab c integer.

The easiest way to solve this problem is the exhaustive method (the easiest programming solution)...

A=2, B=3, C=5 are obtained

a=1 b=2 c=7

a=3 b=4 c=3

a=4 b=5 c=1 is solved.

x+y+z=10

6x+4y+5z=49

You can list the values from here.

Set should be added to the drug x grams.

From the problem x 100=1 250 to get x = kg.

Solution: Set in 100 kg of water should be added to the medicine x kg.

1：250=x：100

x = kilogram = 400 grams.

Answer: 400 grams of medicine should be added to 100 kg of water.

Solution: From point C, CE is perpendicular to AB, (and the tangent should be perpendicular to AB and intersects on the circle, assuming that the tangent is CO, it is only necessary to prove that O and E coincide, CE is already perpendicular, that is, the length of CE = the length of CO, and the two points coincide, that is, the length of CE is the radius of the circle).

A=30 In a triangular CAE, the right-angled side opposite by the 30 degree angle is half the hypotenuse, so CE= AC

So ce is equal to the length of the radius.

Add a guide line from the center of the circle to the tangent point.

Then prove that it is perpendicular to AB and it would be fine

The town of Mapyu Kibi raised its head to investigate.

Check out the explanation.

My answer.

<> Zhou Naiyin took Changlu with him.

(1) Xiaohong takes 20% less time than Xiaojuan, that is, less (50-40) 50=20%.

2) Xiaojuan takes 25% more time than Xiaohong, that is, more (50-40) 40=25%.

3.Hainan Island is larger than Taiwan Island (

4.Over-completion (6000-5000) 5000=20%.

Only 1. 240 divided by 40 equals 60 240 divided by 50 equals 48 (60-48) divided by 48 equals twenty-five percent.

None of them except 240 are wrong, otherwise what would 240 do.