A =\(\dfrac{2n+1}{n-3}\)+ \(\dfrac{3n-5}{n-3}\)- \(\dfrac{4n-5}{n-3}\). tìm giá trị của n để

a, A là 1 ps

b, A là 1 số nguyên

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Ai làm đúng và nhanh nhất mình sẽ tick max điểm