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1) Since the inner angle of the triangle is 180°, c = 180-22°35 minutes - 57°42 minutes = 179°60 minutes - 22°35 minutes - 57°42 minutes = 157°25 minutes - 57°42 minutes = 99°17 minutes.

2) Since the inner angle of the triangle is 180°, the first angle is 180°*1 1+3+4, the second angle is 180°*3 1+3+4, and the third angle is 180°*4 1+3+4, the first angle is solved, the second angle is, and the third angle is 90°

3) Because the angle a = 32 ° 47 minutes, the angle b = 2 * angle a + 30 ° 20 minutes, so the angle b = 2 * 32 ° 47 minutes + 30 ° 20 minutes = 65 ° 34 minutes + 30 ° 20 minutes = 95 ° 54 minutes, because the triangle inner angle and 180 °, the angle c = 180 ° - 95 ° 54 minutes = 84 ° 6 minutes.

Solution: (1) Set up team A to complete the total amount every day.

x B completes the total amount per day.

y is known by the title:

24（x+y）=1

20x+40y=1

The two formulas are combined, and the solution is: x=1 30

y=1/120

So. Team A takes 30 days to complete.

Team B takes 120 days to complete.

2) Borrow the above. xy

Respectively, it means that the two teams of A and B spend money every day, and they are known by the title:

24（x+y）=120

20x+40y=110

The two formulas are combined, and the solution is: x=

y=So Team A uses.

1.35 million yuan.

Team B uses 600,000 yuan.

1. Xiao Ming walked at a speed of 10 kilometers and hours (hours, Xiao Qiang set off from school and rode a motorcycle according to the original road for 24 minutes (24 60 hours) to catch up with Xiao Ming, so the motorcycle speed = 10 (kilometers and hours.

2. The school is located x kilometers away from the shopping mall. Awareness according to the topic (x 3)-(x 5)=1-12 60=4 5

Solution(x 3)-(x 5)=4 5 gives x = 6 km.

3. A certain unit marched, walked for an hour, traveled 20 * kilometers more than an hour by car, and walked (150-90) * [ kilometers.

Traveled a kilometer by car.

4. Set a plan to dig x square per hour. Also in t hours, (x-3)*t=51 was dug in the morning and (x+6)*t=51+27=78 was dug in the afternoon

The solution (x-3)*t=51, (x+6)*t=78 gives x=20 squares.

5 Let the distance between A and B be s, and the speed V from B to A.

According to the title, there are s 40+s v=(2s) 48

Solution s 40+s v=(2s) 48 yields v=60

6. Set the distance s between A and B, the speed of Li and Zhang (v+2).According to the title, there are 2v+2*(v+2)+36=s, 4v+4(v+2)-36=s

The solution is 2v+2*(v+2)+36=s, and 4v+4(v+2)-36=s gives s=108 km.

7. (1) Divide 36 into the sum of two numbers divisible by 8 and 4: one by 4 + 4 by 8. 3 cars for 4 people + 3 cars for 8 people.

5 cars for 4 people + 2 cars for 8 people. 7 cars for 4 people + 1 car for 8 people. 9 cars for 4 people.

There are 5 combinations in total.

2) Among the above 5 combinations, the cost of one car by 4 people + 4 cars by 8 people = 200 + 4 * 300 = 1400 yuan is the most cost-effective.

The cost of 9 cars by 4 people = 9 * 200 = 1800 yuan is the most expensive.

8. According to the topic, the walking frequency ratio of A and B is 5:6A and B step distance 4:7. Therefore, the walking speed ratio of A and B is (5*4):(6*7)=10:21

Now A runs 55 meters first, and B starts to chase A. After the t time, 55+10t=21tThe solution yields t=5So A runs another 10*5=50 meters, and B can catch up with A.

9. When a seventh-grade student was doing his homework, he accidentally knocked over the ink, so that only the following words were seen in a homework question: "A and B are 40 kilometers apart, when the speed of a motorcycle is 45 kilometers, and when the speed of a freight truck is 35 kilometers, (Q: How long does it take for a motorcycle and a cargo truck to meet when they start from A and B in the opposite direction?) The parentheses indicate some of the text covered in ink) Complete this assignment and list the equations.

Set to meet when you were a child. According to the meaning of the title, there are 45t + 35t = 40 to solve t = hours.

This is probably because the person who lazy did the homework left by the teacher and did it yourself, and then posted it on the Internet to ask for help with your homework.

I think. You've got enough time to type so many words for you to finish.

The original price is 92 1+15%)= 80 (RMB).

If you sell for $100, you will earn (100-80) 80 100% = 25%.