Let the unit vectors a, B, C satisfy a + B + C = 0, a is perpendicular to B, the module of a is equal to 1, the module of B is equal to 2, then the square of the module of C is equal to?

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• 1. It is known that the ellipse C: X squared of a squared plus y squared of B squared is equal to 1, a is greater than B is greater than 0, passes through the point (0,2) and the eccentricity e is equal to two-thirds of the root sign 2. Find the equation of the ellipse
• 2. What is the square of C × the square of D + D - (c + - 1 / D)
• 3. Given that four positive numbers a, B, C and D satisfy a + D = B + C, b square = AC, and two thirds of C equals one part of B + one part of D, try to find a: B: C: D It's a detailed process
• 4. If the square of a-2ab-8b = 0 (AB is not equal to 0), then a of B is equal to?
• 5. Given the square of a-2ab-3b = 0 (AB is not equal to 0), then the value of a of B + B of a is 0
• 6. Given that AB is not equal to 0, the square of a - the square of ab-2b = 0, then the value of 3a-b / 3A + B is
• 7. Given that AB is not equal to 0, and the square of a-2ab-3b = 0, find (a + AB + 2b) of (a-3ab + b) Urgent,
• 8. 1. If A-B = 4 and ab = half, then (a + b) is square=_____ 2. (a + b) square = (a-b) square + m, then the Formula M represents is=_____ 3. (a + b) square = 16, xy = 3, then (a-b) square=_____ 4. (a + B + C) square = () square + 2B () + b square 5. Given x + y = 7, xy = 2, find the values of the following formulas (1) The value of 2x square + 2Y square the value of (2) (X-Y) square
• 9. If the square of (a + b) is m, and the square of (a-b) is n, we use the formula containing m to express the power of (AB) 3
• 10. 1. Given that m plus 1 / 2 is equal to 5, find the square of m plus 1 / 2 of M
• 11. Why is the sum of squares of the unit vector equal to one Amount```` Let the unit vectors be j and I be Square of j + square of I = 1 reason!
• 12. If a and B are unit vectors, why is a square equal to b square?
• 13. Known vector a = (2cos square x, √ 3) B = (1, sin2x), function f (x) = a · B, find the minimum positive period and monotone increasing interval of (1) function f (x)
• 14. If we know that the absolute value of the square of (x minus 1) plus 2, x minus y plus a is equal to 0, and Y is negative, then the value range of C is 0
• 15. The square of X + the square of Y - 8x - 10Y + 41 = 0
• 16. The square of x plus the square of Y minus 8x minus 10Y plus 41 is equal to 0. Find the square of Y / x minus XY plus the square of X / y minus XY
• 17. X is equal to the root 3 minus 2, find the fourth power of x plus 4 times the third power of X, add 3 times the second power of x plus 8x minus 4
• 18. The third power of x minus the second power of 8x plus 19x minus 12 equals 0,
• 19. Proof: if the square of two sides of a triangle is equal to the square of the third side, then the triangle is a right triangle Known: Verification: prove:
• 20. If three line segments a, B and C satisfy that a square equals C square minus b square, is the triangle formed by these three line segments a right triangle? Why? A right triangle is only if it satisfies the Pythagorean theorem