It is known that the solution of the system of equations ax + by = 3bx + ay = 7 is x = 2Y = 1, then the value of a + B is () A. 3B. -3C. 103D. −103
Substituting x = 2, y = 1 into the equations, 2A + B = 3, ① 2B + a = 7, ②, ① + ②: 3 (a + b) = 10, then a + B = 103
RELATED INFORMATIONS
- 1. Given that the solution of the system of equations {ax by = 4, BX + ay = 5 is {x = 2, y = 1, then a + B = ()
- 2. If A-B > 0, then a > B. given A-B > 0, X-Y < 0, compare ax + by and BX + ay If A-B > 0, then a > B. given A-B > 0, X-Y < 0, compare AX = by and BX + ay Urgent excavation, to be handed in tomorrow
- 3. Using the formula method: given a < B, x < y, try to compare the size of AX + by and BX + ay
- 4. ax+ay-bx-by=(ax+ay)-( )=( )( )
- 5. It is known that the opposite number of X is 3, the absolute value of Y is 4, and the sum of Z and 3 is 0. Find the value of XY + YZ + XZ
- 6. Given that the opposite number of X is - 3, the absolute value of Y is 0, and the reciprocal of Z is - 1 / 3, try to find the value of XY + YZ + XZ
- 7. It is known that the opposite number of X is 3, the absolute value of Y is 4, and the sum of Z and 3 is 0. Find the value of XY + YZ + XZ
- 8. X = - 3, the absolute value of y = 5, Z + 3 = 0, find the value of xy-yz + XZ
- 9. Let a, B, x, y ∈ R and satisfy A2 + B2 = m, X2 + y2 = n, the maximum value of AX + by is ⊙___ .
- 10. Given x + y = m, a + B = n, then the maximum value of AX + by is?
- 11. If x = − 2Y = 1 is the solution of the system ax + by = 1bx + ay = 7, then the value of (a + b) · (a-b) is () A. -353B. 353C. -16D. 16
- 12. If the real numbers a, B, X and y satisfy ax + by = 3 and ay BX = 5, then the value of (A2 + B2) (x2 + Y2) is______ .
- 13. If the real numbers x and y satisfy (X-2) 2 + y2 = 3, then the maximum value of YX is______ .
- 14. (x²+x)²-26(x²+x)+120 ax+ay+bx+by-a-b x²(x²-y²)-72y⁴
- 15. (ax+by)²+(ay-bx)²
- 16. x²-y/ax-bx+ay-by=?
- 17. A new operation *, X * y = ax + by-3, is defined for real number X. y, where a and B are constants. If 1 * 2 = 9, (- 3) * 3 = 6, find the value of 2 * (- 7)
- 18. For real numbers, a new operation is defined, X * y = ax + by + XY, where a and B are constants, 2 * 1 = 7, (- 3) * 3 = 3, and the value of one third * 6 is obtained
- 19. Given that the maximum value of function f (x) = AXF / x ^ 2 + A is 1 / 2, find the value of real number a It is known that the maximum value of F (x) = ax / x ^ 2 + A is 1 / 2 How to find the value of real number a Second, if f (x) is a decreasing function in the interval (m, 2m-1), find the value range of real number M Finding the maximum and minimum of derivative f '(x) of function f (x)
- 20. Given that inequality 2a-5x > 2x-1 holds for any x ∈ [0,1], then the value range of real number a is? Please provide a variety of solutions