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Bài đấy ra 6cm

Suppose f(x) is a polynomial of x.If f(x) has a remainder of 3 when it is divided by 2(x-1) and 2f(x) has a remainder of -4 when it is divided by 3(x+2).Thus when 3f(x) is divided by 4(\(x^2+x-2\)),the remainder is ax+b,where a and b are constants.Then a+b=...............