![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
If x + 4 / 3 = y + 3 / 2 + Z + 8 / 4, and X + y + Z = 12, find the value of X, y, Z
Let k = x + 4 / 3 = y + 3 / 2 + Z = 8 / 4
x+4=3k
y+3=2k
z+8=4k
therefore
x=3k-4
y=2k-3
z=4k-8
x+y+z=12
3k-4+2k-3+4k-8=12
9k=27
k=3
x=3k-4=5
y=2k-3=3
z=4k-8=4
If 3 / x + 4 = 2 / y + 3 = 4 / Z + 8, x + y + Z = 12, what is the value of X, y, Z?
Let 3 / x + 4 = 2 / y + 3 = 4 / Z + 8 = K
3=k(x+4) 3=kx+4k (1)
2=k(y+3) 2=ky+3k (2)
4=k(z+8) 4=kz+8k (3)
(1)+(2)+(3)
k(x+y+z)+4k+3k+8k=9
12k+4k+3k+8k=9
27k=9
k=1/3
Substituting (1) (2) (3) respectively
x=5
y=3
z=4
x
Then Z + 2 / y = 4, and Z + 3 / y = 4
A2
B﹣2
C﹣4
D4
X = 5, y = 3, z = 4, the result is equal to - 2, if you choose B, you will get points
RELATED INFORMATIONS
- 1. Given that the x power of 3 = 2, the x power of 2 = 3, the Y power of 3 = 4, the Y power of 2 = 5, find the (2x + y) power of 6; the (2x-y) power of 12; the (2x-y) power of 3 (2x-y) power of (x-2y) - 2
- 2. The third power of 8 (x + y) / 1 / 2 (x + y)
- 3. 2 math problems (solution)! (1) A store will first increase the original price of a certain type of color TV by 40%, and then write "big reward" in the advertisement, with 20% discount. After customers complain, the law enforcement department will impose a fine of 2700 yuan per set according to 10 times of the illegal income, and ask for the original price of the color TV (2) When a shopping mall sells a certain product at a fixed price, it gets a profit of 45 yuan per gram. Now, the profit from selling 8 pieces of the product at 85% of the fixed price is the same as the profit from selling 12 pieces at a price reduction of 35 yuan per piece
- 4. Who can solve a mathematical problem with equation 1. A total of 105 pens and brushes were purchased, 21 yuan for each pen and 25 yuan for each brush. Mr. Cheng said that he needed to pay 2447 yuan in advance, but Mr. Wang said that if he only bought these two pens, he would be wrong. Please use the equation to solve why. 2. Mr. Cheng suddenly remembered that the budget also included a signature pen that the president asked to buy. If the price of the signature pen is an integer less than 10 yuan, please calculate it, Write down the unit price of the pen directly——
- 5. 3（X+2.1）=10.5 2（X-3）=5.8 13（X+5）=169 X/1.44=0.4 5X+7=42 3.85=1.5=6.1 X/4.2=2 6X-0.9=4.5
- 6. Who can I solve this simple equation It is proved that the value of the algebraic formula 3x Λ 2-6x + 5 is not less than 2 Thank you for your help
- 7. The price of a commodity is calculated according to 25% of the profit. Later, due to the overstocking of inventory and the urgent need for additional funds, it is decided to sell at a lower price. If each commodity can still get 10% of the profit, how much discount should it be sold at the current price? (reducing the price to a few percent of the original price is called a discount. For example, the price of a commodity with a price of one yuan is 75 percent, which is called a "75 percent discount")
- 8. 7÷x=4/15 4/5x=3/10
- 9. A primary school mathematics problem, on the proportion of the best equation solution (simple equation) If someone travels 5 kilometers per hour from a to B, he will arrive 4 hours later than the scheduled time. If he travels 7 kilometers per hour, he will arrive 2 hours earlier than the scheduled time
- 10. Given the odd function f (x) defined on R, if x > 0, f (x) = (1 / 2) ^ x, find the analytic expression of F (x)
- 11. Given 2 ^ x = 8 ^ + 1,9 ^ y = 3 ^ X-9, find the value of X and y
- 12. It is known that the quadratic function y = - 3 / 2x + 6x + 8, when x (), the function y gets the most () value ()
- 13. Given 1 / x + 1 / y = 2, find the value of (x + y + 2XY + 2Y) / (2XY + y). Thank you,
- 14. If the two solutions of the equation x + 2x = C + 2C about X are x = C, x = 2c, then the solution of the equation x + 2x − 1 = a + 2A − 1 about X is () A. a，2aB. a-1，2a−1C. a，2a−1D. a，a+1a−1
- 15. How can 720 * x = (720 + 80) * (x-3) solve this equation
- 16. Given a = - 1 / 2, B = - 3, find the value of algebraic formula 2 × aa-1 / 3 × BB + 5
- 17. The function y = f (x + 8) is even, ∴f(-x+8)=f(x+8), X = 8 is the symmetry axis of the image of the function y = f (x), Why can we see from F (- x + 8) = f (x + 8) that x = 8 is the axis of symmetry? If y = (x + 4) is an even function, can we say that the axis of symmetry is x = 4
- 18. Given that y = f (x + 1) is an even function, then the symmetry axis of the image of the function y = f (x) is () A. x=2B. x=-2C. x=1D. x=-1
- 19. If an odd function has a maximum in [a, b], then the function has () A. Minimum B. maximum C. no maximum D. cannot be determined
- 20. The inverse scale function has three axes of symmetry