Tính đạo hàm:

$y=\frac{9+2\sqrt{4-x^2}}{\sqrt{2-x}+\sqrt{2+x}}$
tách tử thành $4+2\sqrt{2-x}.\sqrt{2+x}+5$ sau đó rút gọn vs mẫu
biến đổi $y=\sqrt{2-x}+\sqrt{2+x}+\frac{5}{\sqrt{2-x}+\sqrt{2+x}}=\sqrt{2-x}+\sqrt{2+x}+\frac{5.(\sqrt{2-x}-\sqrt{2+x})}{2x}$
tự làm tiếp nhé,những tp dễ r
m lam thì làm chứ đừng cmt kiểu này nhìn ngứa mắt lắm –  Dép Lê Con Nhà Quê 25-02-14 09:33 PM

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