If {x, XY, LG (XY)} = {0, | x |, y} then log8 (x ^ 2 + y ^ 2)

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• 1. Given the set a = {(x, y) | x | + | y | = a, a > 0}, B = {(x, y) | XY | + 1 = | x | + | y |}, if a ∩ B is a set of vertices of a regular octagon on a plane, then the value of a is Please explain why,
• 2. Let (X & sup2; + Y & sup2;) (A & sup2; + B & sup2;) = (AX + by) & sup2;, and XY ≠ 0, ab ≠ 0, try vector method to prove X / a = Y / b
• 3. Given that 1 divided by x plus 1 divided by Y equals 3, find 3x + XY + 3Y divided by x-xy + y
• 4. If 4.5 divided by x equals 4 divided by Y, what's the ratio of XY
• 5. In the mapping f: A-B, a = b = {(x, y) | x belongs to R, y belongs to R}, F: (x, y) → (x + 2Y, 2x-y), then the element in B corresponding to element (3,1) in a = is
• 6. Given the set a = {(x, y) | x + y = 1}, mapping f: a → B, under the action of F, the image of point (x, y) is (2x, 2Y), then the set B is______ ．
• 7. If a = {(x, y)} is a set under a mapping, B = {(2x-y, x + 2Y)}, we know that C = {(a, b)} is a set under F If a = {(x, y)} set B = {(2x-y, x + 2Y)} under the mapping and C = {(a, b)} set D = {(- 1,2)} under f are known, the values of a and B are obtained
• 8. Let a = b = {(x, y) ｜ x belong to R, y belong to R}, mapping f ∶ a → B maps elements (x, y) in a to elements (X-Y, 2x + y) in B, Then under the mapping f, the corresponding element of element (1,2) in a in B is ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
• 9. It is known that the set a = R, B = R +, F: a → B is a mapping from a to B. if f: X → 2x – 1, then the primitive image of element 3 in B is the process to be solved. Thank you It is known that the set a = R, B = R +, F: a → B is a mapping from a to B. if f: X → 2x – 1, then the primitive image of element 3 in B is To solve the process, thank you. What else is the original image
• 10. Given that the elements (x, y) in the set a correspond to the elements (x + y, X-Y) in the set B under the mapping f, then the elements (4, - 2) in the set B correspond to the elements (x + y, X-Y) in the set a__________ x+y=4, x-y=-2 x=1,y=3. (1,3) Why not the other way around? x+y=-2, x-y=4?
• 11. If the set {x, XY, LG (XY)} = {0, | x | y}, then log8 (x2 + Y2)=______ ．
• 12. If the set {x, XY, LG (XY)} is equal to {0, absolute value of X, y}, then what is log8 (x + y)?
• 13. If the set {x, XY, LG (XY)} = {0, | x | y}, then log8 (x2 + Y2)=______ ．
• 14. Given the set a = {x, XY, X-Y}, B = {0, | x | y}, and a = B, find the value of X, y
• 15. (1) Quarter y ^ 2-xy + x ^ 2 (2) - A ^ 4 + 2A ^ 2b-b ^ 2 (3) In Polynomials: (1) x ^ 2 + XY + y ^ 2; (2) - x ^ 2 + 2xy-y ^ 2; (3) x ^ 2 + 2xy-y ^ 2; (1-x + quarter x ^ 2), it is () A.（1）（2）（3）B.(2)(3) C.(2)(4) D.(2)(3)(4) Question (1) (2) above is calculation
• 16. If a + 2B / 2a-b = 9 / 5, then a: B=____ X-1 / X (x-1) = 1 / X if__ If 1 / X-1 / y = 2, then 3x = 5xy-3y / x-xy-y=____
• 17. Let s be a nonempty subset of real number set R. if x, y belong to s, x + y, X-Y, XY belong to s, then s is called a closed set 1. The set s = {the root of a + B is 3 | a, B is an integer} is a closed set; 2. If s is a closed set, then 0 must belong to s; 3. A closed set must be an infinite set; 4. If s is a closed set, then any set t satisfying s contained in T and R is also a closed set The true proposition is------
• 18. M square - 9 / 4 M-4 × (1 + m square - 8m + 16 / 10m-19) △ M-3 / 1
• 19. Given m + 1 / M = 3, find the square of M + 1 / 2 of M Be more reliable. I hope you can write down the process~
• 20. Comparison of a math problem in Senior Two If a > 0, b > 0, then the relation between the power of (a + b) / 2 of P = (AB) and q = a ^ b * B ^ A is