How to do these problems and equations urgently, I will have to hand in later

1) Let the other base be x, and the height of the trapezoid according to the theme is 6, according to the trapezoidal area formula.

5+x)*6/2 = 54

2) Let the small be x, then the fat is 3x, and the equation is obtained.

x + 3x = 80

Solution x=20

3) If Xiao Gang has x storybooks, then Xiao Ming has 3x-8 books, according to the title.

3x-8-x = 100

The solution is x=54

Then Xiao Ming has 3x-8 = 3*54 - 8 = 154 (Ben) or Xiao Ming has 100 + 54 = 154 (Ben)4) Set x hours to meet after the title.

50x + 70x = 600

The solution is x=5

5) If two cars meet x hours after the passenger car leaves, then the two cars meet after the truck drives 2+x hours, according to the topic.

40（2+ x) +60x = 380

Solve x=3

Then the trucks meet after 2+x = 2+ 3 = 5 (hours).

6) Set the speed of the armor to x, according to the title.

20x = 20*60+400

Solution x=80

7) Let the speed of B be x, according to the topic.

40*20 + 600 = 20x

Solution x=70

Can I give a bounty?

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36 people excited, Ming Sun Kai.

5 boat Kai yards.

See the filial piety picture below, you can click on the good answer to enlarge:

Solution: Set up x boats.

Then: 9(x-1) = 6(clear and sensitive x+1).

Move items to obtain: 3x= 15

i.e. x = 5

A: A total of 5 boats were chartered, and the number of students was 36.

Let the number of people be x, then: x 9=x 6-1

6x=9x-54

3x=54x=18

Answer: There are a total of 18 people in the five (2) class hall of He Chun.

Let the velocity of Xiaoding be x meters per minute, and the equation is listed according to the problem

20＋2)x＝20×220

22x＝4400

x 200 So, the speed of Xiao Ding is 200 meters per minute.

The bus and van meet after X hours.

60x-45x=

15x=x=Xiangchong Mausoleum Distance: 60 km.

Set up to meet after x hours.

15x=x=distance between two cities = (60+45) km).

Answer: The two Xiao cars met after driving an hour, and the city Zheng shouted that the front was thousands of kilometers away.

Set the pins to meet x hours later. There is a collapse.

60x-45x=

15x=x=so meet after hours.

The distance between the two cities is =

This question can be set up after the master processes x hours, and the parts made by the two people are equal, according to the meaning of the question:

20x=(x+3)×14

Solution: x=7

Master processing time = x

20x = 14(x+3)

20x=14x+42

7x=42x=6After 6 hours of processing time, the master and apprentice process the same number of parts.

Each room needs to be painted, and the wall area is x

8x-40）÷3-9x÷5=30

Solution x=50

Then the master brushes (8 50-40) 3=120 square meters per day.

Apprentices cavity rubber brush 120-30 = 90 square meters per day.

36 50 (120 + 90 2) = 6 days.

A: Each room needs to be painted with a floor area of 50 square meters.

It takes 6 days to complete.

Each mountain room has a painting area of x square meters.

Then the daily painting area of the master is (8x-40) 3, and the apprentice is (9x) 5

-(9x) 5=30 of the column equation

Solution x=50

Then the master is 120 per day, the apprentice is 90 per day, and one master and two apprentices are 300 per day, so the number of days required is (50*36) 300 = 6 days.

Solution: The original plan was to arrive at place B in x hours. ﹙36x÷3﹚÷36+（36x-36x÷3）÷（36×2）=

Simplify the original equation to obtain: x 3 + x 3 =

2x 3 = both sides of the equation at the same time 3 gets: 2x=

Both sides of the equation at the same time -2x yield:

So x = so the distance is 36 km).

A: The distance between the two places is 162 km.

A: The distance between the two places is 108 kilometers.

Question 7. Original = 3x81 x [(-1 3)] 1 to the power of 1 3 x1 of 27

243x1/9+3x1

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