Toán Lớp 9: A= x+12/x-4 B=1/ căn x -4/ căn x-2 tính A khi x =9 rg P=A+B -

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Toán Lớp 9: A= x+12/x-4 B=1/ căn x -4/ căn x-2 tính A khi x =9 rg P=A+B