Given that 14a2 + 9b2 − a + 12b + 5 = 0, find the value of (a − 2) 2A2 − B2

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• 2. Are all odd numbers prime
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• 5. P is in the angle AOB. Points m and N are the symmetric points of point P about OA and ob respectively. The perimeter of triangle PEF is 15. Find the length of M and n
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• 7. Known circle C: [X-1] ^ 2 + [Y-2] ^ 2 = 2. Point P [2. - 1] is tangent to circle C through point P, PA, Pb ah, is tangent point 【1】 Find the linear equation of PA and PB [2] find the length of tangent PA [3] find the sine length of ∠ PAB [4] find the linear equation of ab?
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• 11. The bottom of a cone is 8 cm in diameter and 6 cm in height. It is filled with water. Pour all the water into the bottom. The area is 12.56 How many centimeters is the water depth in a square centimeter cylindrical container?
• 12. F (x) = LG (1 + 2 ^ x + 4 ^ XA) / 3, where a ∈ R, if f (x) is meaningful when x ∈ (- infinity, 1], find the value range of A
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• 16. Simplification ratio Less difficult, no points
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• 18. Under what circumstances can both sides of the equation multiply or divide by an unknown number
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