Three times of X is more than 18

RELATED INFORMATIONS

• 1. 10 is less than 4 times of x 2. How to set up the equation and what is the solution of X
• 2. The sum of a number and 3 is 10 less than twice the number?
• 3. The ratio of length to width of a rectangle is 7:5. If the width is increased by 14 cm, the rectangle will become a square. The area of the original rectangle is___ Square centimeter
• 4. According to the equation "5 times of X is bigger than half of X"_____ , then x=_____ Brothers and sisters, time does not wait,
• 5. 48 / x + 4 (48 / 4 of X + 4) + 48 / x-4 (48 / 4 of x-4) = 9
• 6. 2.4 * (10 + x) = 48
• 7. There are twelve numbers 1,2,3, ····················································································· At least four
• 8. A new operation is defined as X & y = (x + 1) (Y-2) (1) calculation: - 2 & 2 (2) if X & 5 = 12, find the value of X & the sign is a multiplication sign A new operation is defined as X & y = (x + 1) (Y-2) (1) Calculation: - 2 & 2 (2) if X & 5 = 12, find the value of X &This symbol is a multiply sign with a circle outside
• 9. For the rational number A.B, define and calculate a & B = 3A + B / a-3b, calculate: (- 2) & (7 & (- 6)) & = a sign (plus sign, minus sign, multiplication sign, division sign)
• 10. It is not allowed to list equations 1. A rectangular playground, 450 meters long and 231 meters wide, with trees planted at the four corners and all around. The distance between two neighboring trees is equal. How many trees should be planted at least? If you buy a sapling for 8 yuan, how much will it cost to buy these trees? 2. Uncle Wang has three children. The eldest goes home once every three days, the second goes home once every four days, and the third goes home once every six days?
• 11. Two 7-year-old practical problems (solved by equation) 1. Xiaoming and Xiaoli run back to each other along the circular track at the same time. They meet each other every 15 seconds. It is known that Xiaoming runs a lap for 24 seconds, and Xiaoli runs a lap for how many seconds? 2. At present, the concentration of 5% Guozhen beverage is 200g. If the concentration is to be increased to 10%, how much Guozhen should be added to the beverage?
• 12. Practical problems of Grade 7 (solved by equation) 1. Ask the child's age, and answer: "9% less than half of my father's age", ask the father's age, and answer: "3 times older than my child's age", and ask the child's age? 2. The price of a commodity is increased by 50% of the cost price, and then 20% off (80% of the price). The price is 240 yuan. How much is the profit of this commodity? 3. There is a train passing through the first and second tunnels at the speed of 600 meters per minute. It is known that it takes 5 seconds more to pass through the second tunnel than the first tunnel. The length of the second tunnel is twice that of the first tunnel, and it is 50 meters shorter. What is the length of each tunnel? (write steps or equations)
• 13. There are 29 people working in team a and 17 people working in department B. now the head office has to transfer another 20 people to support team a, so that the number of team a is twice that of department B. how many people should be transferred to department a and department B respectively?
• 14. Check whether the solution of the equation is in the brackets below. [1] 2x-1 = 1 / 2X-4 {x = - 2, x = - 1 / 2} [2] 1 / 2x = 2 / 3x + 2 {x = 12, x = - 12}
• 15. A basic equality relation often used in solving practical problems is "two different formulas representing the same quantity"
• 16. The basic idea of solving fractional equation is to transform fractional equation into integral equation
• 17. What's the difference between integral equation and fractional equation?
• 18. Equations solve practical problems about fractions 1. The number of science and technology books in the library is equivalent to 5 / 12 of story books [1] If there are 360 storybooks, how many are there 【2】 If there are 150 science and technology books, how many story books are there? Xiao Ming read a quarter of the book, and the next day he began to read it from page 25. How many pages is the book? Using equation
• 19. 3/4x-1.2=3/5x
• 20. The key of solving practical problems by quadratic equation of one variable is