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Xiao Ming and Xiao Li
Xiao Hong is jealous
Xiao Li and her elder brother have 180 stamps in total, of which the elder brother has three times as many as Xiao Li. How many stamps do they each have
Suppose Xiao Li has x stamps and her brother has 3x stamps
x+3x=180
The solution is x = 45
45 * 3 = 135 (sheet)
A: Xiao Li has 45 stamps and her brother has 135
The number of stamps of Xiaoyue is 156 more than that of Xiaoli, and the number of stamps of Xiaoyue is three times that of Xiaoli. How many stamps do Xiaoyue and Xiaoli have?
A: Xiaoyue has 234 stamps, Xiaoli has 78 stamps
The volume of object a is 25 cubic cm, and that of object B is 10 cubic cm. The tension of the thin wire is 0.15. What is the density of the two objects?
Object a is above and object B is below. Fasten the two objects with thin lines and put them into water. The two objects just float
P = m / V f floating = P liquid * g * V row
Because it's suspended, so
F floating beetle = P water * g * V beetle = g beetle + 0.15N = P beetle * g * V beetle + 0.15N
(P water-p a) * g * V A = 0.15 n
P a = 400 kg / m3
F floating B = P water * g * V B = G B - 0.15N = P B * g * V B - 0.15N
(P B-P water) * g * V B = 0.15 n
P B = 2500 kg / m3
A: the density of a object is 400 kg / m3, and that of an object is 2500 kg / m3
A piece of ice with a mass of 18kg has a density of 0.9g/cm3. How many cm3 is its mass? All the ice melts into water. What is the volume of water
18kg = 18000g
Mass = Volume X density
Volume = mass / density = 18000 / 0.9 = 20000 CC
Volume of formed water = mass / density = 18000 / 1 = 18000 cubic centimeter = 0.018 cubic meter
What is the mass of a steel ball with a cubic volume of 30cm and a cubic density of 7.9g/cm?
It's 30 * 7.9 = 237g
How many times the cubic power of M is that of DM
One third of D
Find the remainder of (2010 power of 2 * 1000 power of 21) / 83
*It's multiplication, it's division
=(1005 power of 4 × 1000 power of 21) divided by 83
=(1000th power of 4 * 5th power of 4 * 1000th power of 21) divided by 83
=(1000 power of 84 * 5 power of 4) divided by 83
The remainder of 84 divided by 83 to the power of 1000 is 1
The fifth power of 4 = 1024
Divided by 83 = 12, more than 28
So the remainder is 28
1000 power of 2 × (- 1 / 2) 1000 power + (- 1) 2000 power
1000 power of 2 × (- 1 / 2) 1000 power + (- 1) 2000 power
=1000 power of 2 × (1 / 2) 1000 power + (- 1) 2000 power
=1+1
=2
Fill in the appropriate simplest fraction in brackets. 125m = () km 85dm = () m 3750ml=（
Fill in the brackets with the appropriate simplest fraction. 125m = () km 85dm = () m 3750ml = () l 940cm = () m 2190g = () kg 1025dm square = () m square
125m = (1 / 8) km 85dm = (17 / 2) m 3750ml = (15 / 4) l 940cm = (47 / 5) m 2190g = (219 / 100) kg 1025dm square = (41 / 4) m square
RELATED INFORMATIONS
- 1. Xiao Ming ran 100 meters in 18 and 1 / 6 minutes. How long does it take for him to run 120 meters at this speed?
- 2. After Xiaoqiang joined the school sports training team, the time of running 100 meters was shortened from the original 18 seconds to 15 seconds, and the speed of Xiaoqiang's 100 meters was increased by how many percent? (one decimal place before the percent sign)
- 3. In a PE class, the whole class is arranged in four lines, each line has the same number of people. The position of Xiaofang row is the sixth from the front and the seventh from the back. How many students are there
- 4. How many people are there in PE class? How many people are there in PE class
- 5. According to your experience in physical education, the speed of Olympic 100 meter runners should be () A. About 2m / s B. 6m / s C. 10m / s D. 20m / S
- 6. The school held a rope skipping competition. Xiao Hong and Xiao Li jumped 306 times in total. The number of Xiao Hong's jumps was five times that of Xiao Li. How many times earlier were Xiao Hong and Xiao Li
- 7. A classmate said: "Xiao Li and Xiao Fang are both 1.6 meters tall, but Xiao Fang insists that her height is 7 cm higher than Xiao Li. Is this possible? Why?
- 8. Equation: Xiaoli and Xiaoming are on the 400 meter circular track. Xiaoli runs 220 meters per minute and Xiaoming runs 280 meters per minute. They run in the opposite direction at the same point at the same time. How many minutes do they meet? It's an equation. Don't make a mistake
- 9. Xiao Li walks 40 meters per minute from the same place at the same time. After three minutes, Xiao Li is 30 meters behind Xiao Ming. How many meters does Xiao Ming walk per minute
- 10. There are four children kicking shuttlecock, Xiao Hong, Xiao Ming, Xiao Junping each kicked 24 times; Xiao Ming, Xiao Jun, Xiao Liping each kicked 26 times, known as Xiao Hong 22 kicks. How many did Xiao Li kick?
- 11. Xiaoyu and Xiaoli run in the 100 meter race, and each time Xiaoyu reaches the finish line 10 meters ahead of Xiaoli. If Xiaoyu goes back 10 meters and competes with Xiaoli (both start at the same time, and their average speed is the same as before), the result is () A. Xiao Li gets to the end first B. get to the end together C. Xiao Yu gets to the end first D. can't be sure
- 12. Xiaofang and Xiaoli have as much sugar as before. If Xiaofang gives Xiaoli 18, Xiaoli is four times as much as Xiaofang. How much sugar do they have?
- 13. Xiaofang spent three minutes doing 48 mental arithmetic problems and made five mistakes. Xiaoli spent five minutes doing 70 mental arithmetic problems and made nine mistakes. Whose mental arithmetic accuracy is higher
- 14. Two people start from home at the same time, how many minutes later the distance between the two people to the school is equal? (solved by equation)
- 15. In the 100 meter race, Xiao Dong used 18 seconds, Xiao Ming used 1 / 4, who runs fast
- 16. Xiaofang is 5 years old this year. Three years later, teacher Li in Xiaofang kindergarten is 20 years older than Xiaofang. How old is teacher Li this year?
- 17. Four children are taller than Xiao Fang, Xiao Hong is taller than Xiao Li, and Xiao Ying is lower than Xiao Li. Please fill in their names under the appropriate height Whose is the 1.36M? Whose is the 1.32M? Whose is the 1.30M? Whose is the 1.28M?
- 18. In △ ABC, AB is equal to AC, and the sharp angle formed by the intersection of the vertical bisector of AB and the straight line AC is 40 degrees, then the vertex angle of the triangle is
- 19. In △ ABC, ab = AC, and the acute angle obtained by the intersection of the vertical bisector of AB and the line where the edge AC is located is 50 degrees, then what is the size of the base angle ∠ B of △ ABC?
- 20. In the triangle ABC, ab = AC, the acute angle obtained by the intersection of the vertical line of AB and the line where AC is located is 40 degrees, then what is the degree of the base angle B