Solving the equations 2A + B AB = 7a + 2B AB = 8 2A + AB = 7 AB = 8 of a + 2B
The original equation system is: AB / (2a + b) = 8 (1) AB / (7a + 2b) = 8 (2) (1) divided by (2) to get: (7a + 2b) / (2a + b) = 17a + 2B = 2A + B5a = -- BB = -- 5A substitute B = -- 5A into (1) to get: - 5A ^ 2 / (2a -- 5a) = 8 -- 5A ^ 2 / (-- 3a) = 85A / 3 = 8A = 24 / 5B = -- 5A = -- 24
RELATED INFORMATIONS
- 1. What are the multiplication formulas of product 120?
- 2. Through the hyperbola 2x & # 178; - Y & # 178; = 2 (letter with square) right focus make a straight line L intersect the hyperbola at two points a and B, | ab | = 4, how many straight lines satisfy the condition
- 3. A mathematical problem about inequality: we know the mathematical relationship between (2 / 30); (2) Try to use the mathematical relationship you summarized in (1) to explain a phenomenon in the following life: "if M grams of sugar water contains n grams of sugar, and then add K grams of sugar (still unsaturated), the sugar water will be sweeter."
- 4. It is known that x = 1 is a solution of the quadratic equation AX 2 + bx-40 = 0, and a ≠ B. find (a minus b) divided by (2a-2b)
- 5. What is the rule of rational number subtraction
- 6. X & # 178; - 2x-2mx + 2m + M & # 178; = 0 to solve the equation
- 7. A formula for calculating the correlation coefficient r
- 8. On hyperbola It is known that the eccentricity of hyperbola C is equal to 2, and it has the same focus as ellipse x ^ 2 / 24 + y ^ 2 / 8 = 1 (1) The equation of hyperbola C (2) The real axis length and asymptote equation of hyperbola C
- 9. Hyperbola and ellipse have the same focus (0, - 5), (0,5), and the point (3,4) is an intersection point of the asymptote of hyperbola and ellipse
- 10. Hyperbola and ellipse have a common point of intersection, F 1 (0, - 5) f 2 (3,4) is an intersection of the asymptote of hyperbola and ellipse Ideas, principles, the best detailed. Thank you~
- 11. My child uses his fingers to calculate addition and subtraction in Grade 10. He doesn't want to use his fingers. I said he would not report to the mental arithmetic class. What's a good way to calculate accurately and quickly
- 12. Given f (x) = x / x-a (≠ a), if a = - 2, we try to prove that f (x) increases monotonically in X ≤ - 2
- 13. This is a parametric equation. To find the first and second derivatives, we need to be a little more specific, x=a cos t y=b sin t I'm in a bit of a hurry
- 14. Given that the value of X which makes the derivative of function y = X3 + ax2-4 / 3A 0 also makes the value of y 0, what is the value of constant a?
- 15. *How to calculate the formula of LG8?
- 16. A and B start from a to B at the same time, and return immediately after arriving at B. when they return, their respective speeds increase by 20%. 1.5 hours after departure, the two vehicles meet. It is known that when B arrives at B, a still has 1 / 5 of the distance from a to ab. how many hours does it take a car to go back and forth between ab?
- 17. An object is subjected to two forces of 3 N and 4 n. what is the range of the resultant force?
- 18. It is known that the absolute value vector a = 8, the absolute value vector b = 4, the angle between vector a and vector B is 60 degrees
- 19. In the triangle ABC, ab = AC, the vertical bisector De of AB intersects AB at point D and AC at point E, if the perimeter of the triangle ABC is 3
- 20. Known: 1 / (x ^ 2 + X + 1) + 2 / (x ^ 2 + X + 2) + 3 / (x ^ 2 + X + 3) + +x/(x^2+x+x) What is the limit of this formula when x approaches positive infinity?