Choosen As Best Answer

(a-3)/3 = -2/(2a+1) != 2/(-a-2) = -2/(a+2), 先看前兩個
(a-3)(2a+1) = 2a^2 -5a -3 = -6 => 2a^2 -5a +3 = 0 => (a- 3/2)(2a-2) = 0 => a = 3/2 or 1; 在看2&4
2a+1 != a+2 => 3/2(O, 1(X.
答為3/2

Y

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