Given that A-B = 2 + change sign 3, B-C = 2 - change sign 3, find the value of a's square + B's square + C's Square AB AC BC

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• 1. Square of a plus square of B plus square of C minus AB minus AC minus BC minus AC
• 2. (a + B + C) (the square of a + the square of B + the square of C minus AB minus BC minus AC
• 3. AB (BC minus a square) plus BC (AC minus b square) plus AC (AB minus C Square) 10 out of (x-1) + 1 out of (X-2 + 3x-4) Find the determinant
• 4. 3 / a = 4 / b = 5 / C, find AB BC AC / a square + b square + C square
• 5. If a, B and C are the lengths of the three sides of a triangle, and A2 + B2 + C2 = AB + BC + Ca, we can judge the shape of the triangle and explain the reason
• 6. What triangle is ABC if the side length of 1 satisfies (a-b) (A2 + b2-c2) = 0? (2 represents Square)
• 7. In the triangle ABC, A-B = (A2 + c2-b2 / 2a) - (B2 + c2-a2 / 2b) is used to judge the shape of the triangle
• 8. Higher one super hard function The function defined in satisfies that f (x) is equal to y (x) plus f (y)
• 9. hard Given that f (x) = 1 + log (3) x, (x belongs to [1,27]), find the maximum and minimum values of the function y = [f (x)] - 2F (x ^ 2)
• 10. F (x) = 2x & # 178; - ax + 3, X ∈ [- 2,3] find the maximum and minimum of this function,
• 11. Given 3 / a = 4 / b = 5 / C, find the value of the square of AB BC + AC / A + the square of B + the square of C
• 12. We know that a triangle with three sides a, B and C satisfies the condition that a square plus b square plus C square equals AB + BC + AC
• 13. If the three sides a, B and C of a triangle satisfy that the square of a plus the square of B plus the square of C equals AB plus AC plus BC
• 14. If the three sides of a triangle A.B.C satisfy that the square of a plus the square of B plus the square of C equals AB plus AC plus BC, try to determine the shape of the triangle
• 15. It is known that the three sides of a triangle are a, B and C respectively, and the square of a + the square of B + the square of C equals AB + AC + BC, Please guess what shape this triangle is and explain your reason Thank you for your help!!!!!!!!! I'm in a hurry
• 16. Given that a plus B equals 3, B plus C equals 2, a plus C equals 5, find a square plus b square plus C square plus AB plus AC plus BC
• 17. If ABC is a real number, a ^ 2 + B ^ 2 = 7, B ^ 2 + C ^ 2 = 8, C ^ 2 + A ^ 2 = 9, then the minimum value of AB + BC + AC is
• 18. Given that ABC is a real number with complementary equality, we prove that a ^ 4 + B ^ 4 + C ^ 4 > ABC (a + B + C)
• 19. Let ABC be non-zero real numbers which are not equal to each other, and prove three equations It is impossible to prove that three equations ax ^ 2 + 2bx + C = 0, BX ^ 2 + 2cx + a = 0, CX ^ 2 + 2aX + B = 0 have two equal real roots
• 20. Let A.B.C be any real number which is not completely equal, if x = a-bc, y = b-ac, z = c-ab, Z, then x, y and Z are all less than 0 and no more than 0, then Connect. C at least one ＜ 0, D at least one ＞ 0