It is stipulated that x triangle y = 3x-2y, and known that x triangle (4 triangles 1) = 7
According to the meaning of the title
4 triangles 1
=3*4-2*1
=10
X triangle (4 triangles 1) = 7
X triangle 10 = 7
3x-2*10=7
3x=27
x=9
RELATED INFORMATIONS
- 1. According to the rule x △ y = 3x-2y, then x △ (4 △ 1) = 7, find x =? (the four operation rules remain unchanged)
- 2. On the system of equations x + y = a, 3x-2y = 7, x > y, then what conditions should a satisfy
- 3. Given | X-7 + | y + 13 | = 0, find the value of 3x + 2Y
- 4. Given x + 2Y = 1, find the minimum value of 2 / x + 1 / y
- 5. If x ^ 2 + y ^ 2 = 4, then the minimum value of x ^ 2 + 2Y is
- 6. If x > 0, Y > 0, and X + 2Y = 4, then the minimum value of 1x + 2Y is 0___ .
- 7. (Innovation Extension) known {X-Y + 2 > = 0, x + y-4 > = 0,2x-y-5
- 8. Known | x|
- 9. Given | x | ≤ 1, | y | ≤ 1, and u = | x + y | + | y + 1 | + | 2y-x-4 |, what is the sum of the maximum and minimum value of u?
- 10. Let x > 0, Y > 0 and X + 2Y = 1, find the minimum value of (1 / x) + (1 / y) It's a process Please use the basic inequality to solve the problem Because I didn't learn Cauchy's inequality in my freshman year
- 11. Rule: X △ y = 3x-2y, known x △ 4 △ 1 = 7, find the ratio of X
- 12. If x and y are positive real numbers and xy = x + y + 3, then the minimum value of XY is______ .
- 13. Let X and y be positive real numbers, xy = 8 + X + y, then the minimum value of XY is
- 14. Find XY with 3x ^ 2 + XY + y = 15
- 15. Ask sat math questions The median of a list of 99 consecutive integers is 60.What is the greatest integer in the list?
- 16. Senior, Beijing Normal University Edition
- 17. What's the answer to the 12 questions on page 30 of the seventh grade mathematics volume 2 of Peking University green card PEP edition?
- 18. Answers to green card of Peking University
- 19. Who has the green card of Peking University for the first time of junior high school English? I'm not copying the answer, but writing the right answer!
- 20. Green card of Peking University Grade 8 Volume 1 English answers (cloze) Jeff is very __ 1__ at math. Kate,is not good ai is.Jeff often help her __ 2__ her maths.One nigh Jeff and Kate __ 3__ out their exercise-books and began __ 4__ their lessons.Soon Jeff finished his homework,but his sister __ 5__ .She couldn't work out the last probiem."Let me __ 6__ you,"said Jeff."No,please __ 7__ .I'll do it __ 8__ ,"said Kate.She thought and thought,and __ 9__ an hour she worked it out.She __ 10__ very tired,but very,very happy. 1. A.well B.good C.better D.best 2. A.to B.in C.with D.of 3. A.make B.takes C.took D.to take 4. A.make B.to make C.do D.to do 5. A.don't B.can't C.didn't D.finishedn't 6. A.help B.to help C.to call D.say to 7. A.don't B.didn't C.can't D.couldn't 8. A.himself B.myself C.herself D.by me 9. A.before B.behind C.after D.in 10.A.be B.is C.was D.were