Quay lại đáp án

	2	bớt 1 ký tự trong đáp án		Sửa 18-07-16 08:54 PM Lionel Messi 41 3
2) $PT\Leftrightarrow \sqrt[]{(x+6)^3}+\sqrt{x+6}=x^3(x^3+12x^2+48x+64)+x(x+4)$ $\Leftrightarrow \sqrt{(x+6)^3}+\sqrt{x+6}=x^3(x+6)^3+x(x+4)$ $\Leftrightarrow \sqrt{x+6}=x(x+4)\Rightarrow x+6=x^2(x+4)^2$ $\Leftrightarrow (x^2+5x+3)(x^2+3x-2)=0$ 2) $PT\Leftrightarrow \sqrt[]{(x+6)^3}+\sqrt{x+6}=x^3(x^3+12x^2+48x+64)+x(x+4)$ $\Leftrightarrow \sqrt{(x+6)^3}+\sqrt{x+6}=x^3(x+6)^3+x(x+4)$ $\Leftrightarrow \sqrt{x+6}=x(x+4)\Rightarrow x+6=x^2(x+4)^2$ Xong tìm nốt x là xong; Tìm giúp mình nha 2) $PT\Leftrightarrow \sqrt[]{(x+6)^3}+\sqrt{x+6}=x^3(x^3+12x^2+48x+64)+x(x+4)$ $\Leftrightarrow \sqrt{(x+6)^3}+\sqrt{x+6}=x^3(x+6)^3+x(x+4)$ $\Leftrightarrow \sqrt{x+6}=x(x+4)\Rightarrow x+6=x^2(x+4)^2$ $\Leftrightarrow (x^2+5x+3)(x^2+3x-2)=0$

	1	tạo mới		Trả lời 18-07-16 08:42 PM Lionel Messi 41 3
2) $PT\Leftrightarrow \sqrt[]{(x+6)^3}+\sqrt{x+6}=x^3(x^3+12x^2+48x+64)+x(x+4)$ $\Leftrightarrow \sqrt{(x+6)^3}+\sqrt{x+6}=x^3(x+6)^3+x(x+4)$ $\Leftrightarrow \sqrt{x+6}=x(x+4)\Rightarrow x+6=x^2(x+4)^2$ Xong tìm nốt x là xong; Tìm giúp mình nha

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