The box can be made of: 25 * X；; The bottom of the box can be composed of 40*(36-X) pieces, so that it can be matched, including:
25X *2 =40*(36-X)
Solve this equation X= 16.
So 16 sheets are used as the box body and 20 sheets are used as the bottom of the box, which just matches. 5. There are two kinds of trucks, two carts and three cars can transport 15.5 tons at a time, and five carts and six cars can transport 35 tons at a time. How many tons can three cars and five cars transport at a time? Set a cart and a cart to transport X Y tons, 2x+3y =15.55x+6y = 35x = 4y = 2.5. According to the meaning of the question, 3x+5y = 24.5 tons. 6. The road from A to B has an uphill section and a flat section. If you keep going uphill for 3km/h, flat road for 4km/h and downhill for 5km/h, then you can walk from A to B. Solution: flat road for 1km, slope for 1km for x/10+y/15 = 29x/18+y/15. The solution is x=90 y=300, and the whole journey is 300+90 = 390km. A: Yes.
How to write the sixth question on page 108 of the second volume of the seventh grade people's education edition?
The seventh question on page 108 of the second volume of seventh grade mathematics published by People's Education Press: Suppose you need to take X kilograms and Y kilograms of potions containing 30% and 75% drugs.
According to the meaning of the question
x+y= 18
30% x+75% y = 18× 50% (this is a system of equations)
Solve the equation X= 10.
y=8
Answer: You need to take 30% medicinal liquid 10 kg and 75% medicinal liquid 8 kg.
How to do the fifth question on page 1 15 of the seventh grade mathematics book published by People's Education Press? Solution:
According to the meaning of the problem, the ternary linear equations can be listed as follows:
-2=a+b+c
20=a-b+c
(9/4)a+(3/2)b+ c =( 1/9)a+( 1/3)b+ c
To understand this system of equations, we get: a=6.
b=- 1 1
c=3
How to write the fifth question: The answer is not unique: 1. First translate 6 units down, and then translate 3 units to the left. 2. Translate 8 unit lengths up and 6 unit lengths to the right.
Question 6: 1. On a straight line, these two straight lines are parallel to the X axis. 2. On a straight line, these two straight lines are perpendicular to the X axis.
Question 7: 1. (1,9), (1,6)), (2,7), (3,5), (4,2), (5,5), (6,4), (7. (From top to bottom, from left to right).
People's Education Edition, seventh grade mathematics volume II 14 1 page, comprehensive application, the fifth composition can not be found, can you send it?
Mathematics Book, Grade 7, Volume 2, People's Education Edition, page 135, page 5~ 1 1, figure 1.
1and ∠2
Three and four.
Is the internal angle of the straight line DC and AB cut by DB.
In fig. 2
∠ 1 and∠ 2 are the inner angles on the same side of the straight line DC and AB cut by CB.
∠3 and∠ 4 are isosceles angles of AB tangent lines AD and BC.
It must be true, thank you for adopting ~
The title of problem 4.6.7 on page 103 in the second volume of seventh grade mathematics published by People's Education Press. Urgent! 4. Let's buy X tickets for Class A and Y tickets for Class B, according to the meaning in the question.
X+Y=35
24X+ 18Y=750
The solution is X=20.
Y= 15
So buy 20 class A tickets, 15 class B tickets.
6. The number of people going to Yunshui Cave is X, and the number of people going to Huagongling is Y.
X+Y=200
Y=2X- 1
The solution is X=67.
Y= 133
So there are 67 people in Yunshui Cave and 133 people in Huagongling.
Depressed, this page in my book has no title. What is question 7?
How to write questions 3~6 on page 108 of volume 1 of the seventh grade people's education edition? 0 152*250=0.9X-250 X=30
6.30+20X = 90- 10X X = 2 30+20 * 2 = 70
I only know these two things.
The ninth question on page 142 of the seventh grade mathematics book published by People's Education Press, how to make suggestions, or post the question later, otherwise it is impossible to get the answer as you ask now.