Tập các cặp số nguyên dương (x, y) ; x y thỏa mãn điều kiện logx(y+x^2+x-5)=<2 A. 6 . B. 4 . C. 5. D.

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The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.

Angle that produces maximum distance