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There are 44 students in Grade 5 (3) class of sunshine primary school, among which boys account for 5 / 11 of the total number of students in the class, and the number of girls in class 5 (2) is 7 more than that of girls in class 5 (3) So how many girls are there in no (2) class?
Hello:
44×（1-5/11）+7
=44×6/11+7
=24+7
=31 (person)
A: there are 31 girls in class 5 (2)
The highway from Lishan town to the provincial capital is 189 kilometers long, passing through the county. The county is 54 kilometers away from Lishan town. A bus leaves Lishan town at 8:30 in the morning and arrives at the county at 9:15. It stops for 15 minutes and then leaves for the provincial capital. It can arrive at 11:00 in the afternoon. Another bus goes straight from the provincial capital path to Lishan town at 9:00 in the morning. It runs 60 kilometers per hour. When the two cars meet, the provincial capital goes to Lishan town The mountain town bus is running______ Minutes
9: 15 + 15 minutes = 9:30, 11:00-9:30 = 1.5 hours, 30 minutes = 0.5 hours, (189-54) △ 1.5, = 135 △ 1.5, = 90 (km), 189-54-60 × 0.5, = 189-54-30, = 135-30, = 105 (km), 105 △ 60 + 90, = 105 △ 150, = 0.7 (H) = 42 (min)
How long do you drink glucose before 1000 meter long run?
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Is there any way to do the seventh grade Chinese reading problem?
1. First of all, read through the full text to understand the main idea of the full text
2. Look at the problem, analyze the focus of the question, read the full text with the question and try to solve the problem
3. For the unsolved questions, the paper analyzes the context and the main idea of the whole text, and finally answers the general questions
What is the least common multiple of 20 ` 15 and 30
60, right
Reason 1: calculated. 2 * 2 * 3 * 5 = 60
Reason 2: intuition
Reason 3: there are so many people supporting me, of course, 60
The solution ratio is 12:6 = x: 20 and 0.8:3 and 3 / 4 = x: 0.75
X = 40 x = 4 / 25
If the rational number a B satisfies A-1 + b-2011 = 0, then the power of a of B = --
|a-1|=0
a=1
|b-2011|=0
b=2011
b^a=2011^1=2011
A power of B = 2011
If the sequence {an} is known to be both arithmetic and proportional, then the sum of the first n terms of the sequence is ()
A. 0B. nC. na1D. a1n
If the sequence {an} is both an arithmetic sequence and a proportional sequence, then the sequence is a non-zero constant sequence, that is, A1 = A2 = A3 = An, then the sum of the first n terms of the sequence is a1 + A2 + a3 + +An = Na1, so C
It is known that the function f (x) = X2 (ax-3) defined on R, where a is a constant. (1) if a = 1, find the tangent equation of the image of F (x) at points (1, - 2); (2) if x = 1 is an extreme point of function f (x), find the value of real number a; (3) if f (x) is an increasing function in the interval (- 1,0), find the value range of real number a
(1) When a = 1, f (x) = x3-3x2, then f ′ (x) = 3x2-6x = 3x (X-2), then k = f ′ (1) = - 3, then the tangent equation is y + 2 = - 3 (x-1), that is, 3x + Y-1 = 0; (2) f (x) = ax3-3x2, we get that f ′ (x) = 3ax2-6x = 3x (AX-2), ∵ x = 1 is an extreme point of F (x), ∵ f ′ (1) = 0, that is, 3 (A-2) = 0, ∵ a = 2; (3) when a = 0, f (x) = - 3x2 is in the interval (- 1) When a ≠ 0, f ′ (x) = 3ax (x-2a), Let f ′ (x) = 0, then X1 = 0, X2 = 2A, when a > 0, for any x ∈ (- 1,0), f ′ (x) > 0, then a > 0; when a < 0, when x ∈ (2a,0), f ′ (x) > 0, then 2A ≤ - 1, ■ - 2 ≤ a < 0, then a ≥ - 2 meets the requirements
Page 18, question 18
In the tug of war competition, Party A is on the right and Party B is on the left. The balance position is 0. If Party A pulls 1cm to the right, mark as + 1cm, then Party B pulls 1cm to the left, mark as - 1cm. The following table records the process of a contest between the two sides and answers the following two questions. (figure, in words) (1) Party A + 10, ask Party B how much. (2) Party B counts as - 8, ask Party A how much. (3) 8 for Party A and how much for Party B. (4) Party B counts - 6, ask Party A how much. Is the final position left or right? Which side will win?
(1) Party B at - 10
(2) Party A at + 8
(3) Party B is counted as - 8
(4) Party A is counted as + 8
Party A won
RELATED INFORMATIONS
- 1. There are 44 students in class 5 (2), including 24 boys and 20 girls. Boys account for ()% of the class
- 2. There are 60 people in the chorus. Boys account for two fifths of the total. How many girls are there?
- 3. The number of female students in a class is one fifth more than that of male students. The number of male students is () of that of female students. The number of female students is () of that of the whole class
- 4. There are 2 more girls and 22 more boys in a class than 3 / 5 of the class. How many students are there in the class?
- 5. There are 20 boys and 5 / 9 girls in a class. How many students are there in the class A few more Pile a coal is 4 / 5 of pile B coal. If 8 tons are transported from pile B to pile a, pile B is 40 tons more than pile A. how many tons are there in pile a and pile B? How many cuboids do you need to build a cube with a cuboid 12 cm long, 8 cm wide and 10 cm high? Xiao Ming planted a tree every 6 meters along the same road, with a total of 31 lessons. Now Xiao Ming wants to plant a tree every 8 meters without his brother. How many trees should there be without moving? 1 extra point for answering within 1 hour!
- 6. The number of boys accounts for 60% of the class. How many% more boys than girls? How many% less girls than boys?
- 7. If the ratio of girls in a class to the whole class is 7:10, how many percent more girls than boys? Formula
- 8. When x equals 2, what is 3x
- 9. -What is x + 5 = 2 / 3x?
- 10. What is 2x × (3x-5) × x equal to
- 11. The number of girls in class 52 accounts for three fifths of the class. What percentage of boys in girls? What percentage of boys in girls
- 12. The number of boys in a class is 6 more than 5 / 7 of the whole class, and the number of girls is 4 less than 1 / 4 of the whole class
- 13. Boys account for 5 / 9 of the total number in class 52. After 4 girls are transferred, boys now account for 3 / 5 of the total number
- 14. The ratio of boys to girls is four fifths, and boys account for four ninths of the total
- 15. The number of boys in a three-year class is 4 less than 5 / 9 of the whole class. The number of girls in a three-year class is 6 more than 2 / 5 There are six more girls than two fifths of the class
- 16. The number of boys in class 6 (2) is 5 less than 60% of the class, and the number of girls accounts for half of the class. How many girls are there in this class? emergency
- 17. In class 62, the ratio of boys to girls is 9:7. There are six more boys than girls. How many students are there in class 62
- 18. In class 6 (1), boys account for 5 / 9 of the class and girls account for 1 / 2 of the class Is it right or wrong?
- 19. In class 5 (6), female students account for 4 / 9 of the class, while male students account for 5 / 9 of the class?
- 20. The number of girls in class 61 accounts for three fifths of the class. It is known that there are 11 more girls than boys. How many students are there in class 61