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

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• 1. 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
• 2. 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
• 3. 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
• 4. 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
• 5. 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
• 6. 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
• 7. 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
• 8. Square of a plus square of B plus square of C minus AB minus AC minus BC minus AC
• 9. (a + B + C) (the square of a + the square of B + the square of C minus AB minus BC minus AC
• 10. 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
• 11. Given that ABC is a real number with complementary equality, we prove that a ^ 4 + B ^ 4 + C ^ 4 > ABC (a + B + C)
• 12. 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
• 13. 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
• 14. Let a, B, C be any integer which is not completely equal, if x = A2 BC, y = B2 AC, z = C2 ab
• 15. Given that a, B and C are three sides of triangle, and a 2 + B 2 + C 2 + AB + AC + BC, the values of a, B and C are obtained
• 16. Given ABC = 1, a + B + C = 2, A2 + B2 + C2 = 3, find the sum of (AB + C-1), (BC + A-1), (AC + B-1) A2 + B2 + C2 = 3, 2 after a, B, C is the square,
• 17. Given A-B = 3, B + C = - 5, then the value of the algebraic expression AC BC + A2 AB is () A. -15B. -2C. -6D. 6
• 18. Given A-B = - 2, B-C = 5, find the value of a ^ 2 + B ^ 2 + C ^ 2-ab-ac-bc
• 19. Given A-B = 3, B-C = - 1, find the value of a ^ 2 + B ^ 2 + C ^ 2-ab-bc-ac
• 20. It is known that: AB / (a + b) = 1, BC / (B + C) = 2, AC / (a + C) = 3