My aunt bought a total of 5 kg of cucumber and cabbage, which cost 17 yuan, of which 4 yuan per kg of cucumber and 3 yuan per kg of cabbage,

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• 1. A and B start from 120 kilometers at the same time, B is in front. The speed of a and B is 60 km and 40 km. How long can a catch up with B after departure A and B start at the same time from two places 120 kilometers apart, and B is in front of A. the speed of a and B is 60 km / h and 40 km / h respectively. How long can a catch up with B after departure?
• 2. There's also a math problem, 4/x²-1+x+2/1-x=-1
• 3. When the aircraft flies, the flight direction is expressed by the angle between the flight route and the actual South or north direction line. As shown in the figure, the clockwise angle between an (north-south line) and the flight line is used as the flight direction angle. The flight direction angle from a to B is 35 °, the flight direction angle from a to C is 60 ° and the flight direction angle from a to D is 145 °. The angle between AB and AC is multiple Less? What is the angle between AD and AC? And draw the flight line from a with 105 ° angle
• 4. If x-3y = 5, find the value of x ^ 2-3xy-15y Please ~~
• 5. The relation between the N + 1 power of N and the n power of (n + 1)
• 6. The relationship between the power of N + 1 of N and the power of (n + 1) is
• 7. What is the law of the relationship between the power of N + 1 and the power of (n + 1) What are the rules
• 8. The size relation between N + 1 of N and N + 1 power of n From n = 1,2,3,4 Start with these simple numbers and summarize the rules
• 9. Comparison of the size of N + 1 power of N and (n + 1) power of n
• 10. Given that the circle x2 + Y2 + 2x-4y + 1 = 0 is symmetric with respect to the line 2aX by + 2 = 0 (a > 0, b > 0), then the minimum value of 4A + 1b is () A. 4B. 6C. 8D. 9
• 11. Party A and Party B run on a 400 meter circular track. Party B runs 120 meters per minute on average. The speed of Party A is 1.5 times that of Party B, and Party A is 100 meters in front of Party B, How many minutes can a catch up with B? Solve the equation
• 12. 2. Let X and y be real numbers, and (x / 1 + I) * (Y / 1-2i) = 5 / 1-3i, find x + y
• 13. 20 kg of apples and 30 kg of pears cost 132 yuan in total. The price of 2 kg of apples is equal to that of 2.5 kg of pears. How many yuan per kg of apples and pears?
• 14. Vector in Physics
• 15. When a and B start, the speed ratio of a and B is 5; 4. After meeting, a's speed decreases by 20%, and B's speed increases by 20%. Thus, when a arrives at B, B is still 10 kilometers away from A. how far is a and B from each other? How do you write it? I'm in a hurry
• 16. On the inequality of X, the solution set of root x > ax + 1.5 is {x | 4
• 17. The distance between port a and port B is 1200km. Ship a sails from port a to port B at 60km per hour. After 30 minutes of departure, ship B sails from port B to port a at 70km per hour. The two ships meet a few hours after departure
• 18. How do three odd numbers add up to an even number**********
• 19. 24 plus 4 is 28. Is 28 odd or even
• 20. The constant term in the expansion of binomial (x3 − 1x2) 5 is______ ．