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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?
Let's suppose there are x each
（X-18）×4=X+18
4X-72=X+18
4X-X=18+72
3X=90
X=90÷3
X=30
Uncle Hong folded 96 handmade works, and the number of Xiaofang was 1:4. Xiaoli folded 2 / 3 of Xiaofang. How many handmade works did Xiaoli fold
96*4*2/3=256
The average weight of the eight students is 40 kg, including 25 kg for Xiaoli, 40 kg for Xiaogang, 50 kg for Xiaoming, 30 kg for Xiaofang and 30 kg for Xiaohong,
Xiaochong 55 kg, Xiaoyuan 30 kg, xiaopang 60 kg, if the average weight is 0, use positive and negative numbers to express the weight of 8 students
Xiaoli - 15kg, Xiaogang 0kg, Xiaoming 10kg, Xiaofang - 20kg, Xiaohong - 20kg, Xiaochong 15kg, Xiaoyuan - 20kg, xiaopang 20kg
(- 8) 100 power × - (1 / 8) 99 power, (- 0.125) 12 power × (5 / 3) 7 power
(- 8) 100 power × - (minus one eighth) 99 power
(- 0.125) 12th power × (minus five thirds) 7th power × (minus eight) 13th power × (minus three fifths) 9th power
(- 8) 100 power × - (minus one eighth) 99 power, = 8 × (8) ^ 99 × (1 / 8) ^ 99 = 8 × (8 × 1 / 8) ^ 99 = 8 (- 0.125) 12 power × (minus five thirds) 7 power × (minus 8) 13 power × (minus three fifths) 9 power = (1 / 8) ^ 12 × (- 5 / 3) ^ 7 × (- 8) ^ 13 × (- 3 / 5) ^ 9 = - 8 × (1 / 8 ×
Square of [4x (n-1) power, y (n + 2) power] and [- x (n-2) power, y (n + 1) power]
The original formula = (2 (n-1) power of 16x, 2 (n + 2) power of Y) / [(n-2) power of - x, 2 (n + 1) power of y]
=-2 (n-1) - (n-2) power of 16x and 2 (n + 2) - (n + 1) power of Y
=-The (n + 1) power of 16x and the (n + 1) power of Y
If the mass of a block is 120g and the volume is 200cm, the density of the block is g / cm, that is, kg / m
Density = 120 △ 200 = 0.6 g / cm3 = 0.6 × 10 ^ 3 kg / m3
The 100th power of (- 2) is larger than the 99th power of (- 2) () the 99th power of a 2B, - 2 C and 2, and the 99th power of D 3 × 2
The 100th power of (- 2) - the 99th power of (- 2)
=The 100th power of 2 + the 99th power of 2
=The 99th power of 2 × (2 + 1)
=The 99th power of 3 × 2
Choose D
There are 160 grams of water with a density of 1 g / cm3 and 160 grams of alcohol with a density of 0.8 g / cm3. How many grams of disinfectant alcohol can be prepared with these 160 grams of water with a density of 0.84 g / cm3? (volume change during mixing is negligible)
Let M1 g of water and M2 g of alcohol be taken to make m g of disinfectant alcohol with density of ρ. The volume of water and alcohol after mixing remains unchanged. M1 ρ 1 + M2 ρ 2 = M1 + M2 ρ, m11g / cm3 + m20.8g/cm3 = M1 + m20.84g/cm3 can make M1 M2 = 516 ∵ M2 > M1. Therefore, when M2 = 160g of alcohol is taken, M1 = 50g of water can be taken; the maximum amount of disinfectant alcohol can be made is m = M1 + M2 = 50g + 160g = 210g. A: the maximum amount of disinfectant alcohol can be made is 210g
There are 160 grams of water with a density of 1 g / cm3 and 160 grams of alcohol with a density of 0.8 g / cm3. How many grams of disinfectant alcohol can be prepared with these 160 grams of water with a density of 0.84 g / cm3? (volume change during mixing is negligible)
Let m 1g of water and M 2G of alcohol be taken to make m g of disinfectant alcohol with density of ρ. The volume of water and alcohol will not change after mixing. M 1 ρ 1 + M 2 ρ 2 = M 1 + M 2 ρ, m 11 g / cm 3 + m 20.8 g / cm 3 = M 1 + m 20.84 g / cm 3 can make m 1 m2 = 516 ∵ M 2 > m 1. Therefore, when m 2 = 160 g of alcohol is taken, M 1 = 50 g of water can make disinfectant wine at most
The total mass of an empty bottle filled with water is 400g, and the total mass of an empty bottle filled with alcohol (the density of alcohol is equal to 0.8g / cubic cm) is 350g?
Volume X
X = (400-350) / 0.2 = 250 ml
verification:
250*0.8=200
400-250=150
200+150=350
RELATED INFORMATIONS
- 1. 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
- 2. Xiao Ming and Xiao Li
- 3. 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?
- 4. 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)
- 5. 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
- 6. How many people are there in PE class? How many people are there in PE class
- 7. 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
- 8. 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
- 9. 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?
- 10. 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
- 11. 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
- 12. 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)
- 13. In the 100 meter race, Xiao Dong used 18 seconds, Xiao Ming used 1 / 4, who runs fast
- 14. 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?
- 15. 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?
- 16. 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
- 17. 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?
- 18. 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
- 19. It is known that in isosceles △ ABC, ab = AC. if the acute angle of the intersection of the vertical bisector of AB and the line of edge AC is 40 degrees, then the base angle of isosceles △ ABC ∠ B is 40 degrees______ ．
- 20. As shown in the figure, in △ ABC, ∠ a = 40 ° and ∠ ABC = ∠ ACB, the middle vertical line (please draw with a compass and ruler) on the side of AB intersects AC at D and ab at e, connecting BD, (1) Explain why △ ade is congruent with △ BDE (2) Finding the degree of ∠ DBC