Giải phương trình vô tỷ (1) August 28, 2013Minh Huyền Uncategorized 1 Comment ĐK pt Dễ thấy vô nghiệm Vậy pt có 1 nghiệm Nguồn: VMF Share this:TwitterFacebookLike Loading... Related
khi copy từ VMF qua, dấu phân số là “\frac{}{}” nhưng thêm chữ “d” vào đi nhé ! tức là “\dfrac{}{}” thì sẽ đẹp hơn đó Reply
![\Leftrightarrow \sqrt{x+1}-1+ \sqrt[3]{x+8}-2+\sqrt[4]{x+81}-3=\dfrac{3x}{2}](https://s0.wp.com/latex.php?latex=%5CLeftrightarrow+%5Csqrt%7Bx%2B1%7D-1%2B+%5Csqrt%5B3%5D%7Bx%2B8%7D-2%2B%5Csqrt%5B4%5D%7Bx%2B81%7D-3%3D%5Cdfrac%7B3x%7D%7B2%7D&bg=ffffff&fg=375362&s=0&c=20201002)
![\Leftrightarrow \dfrac{x}{\sqrt{x+1}+1}+\dfrac{x}{\sqrt[3]{(x+8)^{2}}+2\sqrt[3]{x+8}+4}+ \dfrac{x}{\sqrt[4]{(x+81)^{3}}+3\sqrt[4]{(x+81)^{2}}+9\sqrt[4]{x+81}+27}=\dfrac{3x}{2}](https://s0.wp.com/latex.php?latex=%5CLeftrightarrow+%5Cdfrac%7Bx%7D%7B%5Csqrt%7Bx%2B1%7D%2B1%7D%2B%5Cdfrac%7Bx%7D%7B%5Csqrt%5B3%5D%7B%28x%2B8%29%5E%7B2%7D%7D%2B2%5Csqrt%5B3%5D%7Bx%2B8%7D%2B4%7D%2B+%5Cdfrac%7Bx%7D%7B%5Csqrt%5B4%5D%7B%28x%2B81%29%5E%7B3%7D%7D%2B3%5Csqrt%5B4%5D%7B%28x%2B81%29%5E%7B2%7D%7D%2B9%5Csqrt%5B4%5D%7Bx%2B81%7D%2B27%7D%3D%5Cdfrac%7B3x%7D%7B2%7D&bg=ffffff&fg=375362&s=0&c=20201002)
![\Leftrightarrow x[\dfrac{1}{\sqrt{x+1}+1}+\dfrac{1}{\sqrt[3]{(x+8)^{2}}+2\sqrt[3]{x+8}+4}+ \dfrac{1}{\sqrt[4]{(x+81)^{3}}+3\sqrt[4]{(x+81)^{2}}+9\sqrt[4]{x+81}+27}-\dfrac{3}{2}]=0](https://s0.wp.com/latex.php?latex=%5CLeftrightarrow+x%5B%5Cdfrac%7B1%7D%7B%5Csqrt%7Bx%2B1%7D%2B1%7D%2B%5Cdfrac%7B1%7D%7B%5Csqrt%5B3%5D%7B%28x%2B8%29%5E%7B2%7D%7D%2B2%5Csqrt%5B3%5D%7Bx%2B8%7D%2B4%7D%2B+%5Cdfrac%7B1%7D%7B%5Csqrt%5B4%5D%7B%28x%2B81%29%5E%7B3%7D%7D%2B3%5Csqrt%5B4%5D%7B%28x%2B81%29%5E%7B2%7D%7D%2B9%5Csqrt%5B4%5D%7Bx%2B81%7D%2B27%7D-%5Cdfrac%7B3%7D%7B2%7D%5D%3D0&bg=ffffff&fg=375362&s=0&c=20201002)
![\dfrac{1}{\sqrt{x+1}+1}+\dfrac{1}{\sqrt[3]{(x+8)^{2}}+2\sqrt[3]{x+8}+4}+ \dfrac{1}{\sqrt[4]{(x+81)^{3}}+3\sqrt[4]{(x+81)^{2}}+9\sqrt[4]{x+81}+27}-\dfrac{3}{2}=0](https://s0.wp.com/latex.php?latex=%5Cdfrac%7B1%7D%7B%5Csqrt%7Bx%2B1%7D%2B1%7D%2B%5Cdfrac%7B1%7D%7B%5Csqrt%5B3%5D%7B%28x%2B8%29%5E%7B2%7D%7D%2B2%5Csqrt%5B3%5D%7Bx%2B8%7D%2B4%7D%2B+%5Cdfrac%7B1%7D%7B%5Csqrt%5B4%5D%7B%28x%2B81%29%5E%7B3%7D%7D%2B3%5Csqrt%5B4%5D%7B%28x%2B81%29%5E%7B2%7D%7D%2B9%5Csqrt%5B4%5D%7Bx%2B81%7D%2B27%7D-%5Cdfrac%7B3%7D%7B2%7D%3D0&bg=ffffff&fg=375362&s=0&c=20201002)
AnnieSally 
khi copy từ VMF qua, dấu phân số là “\frac{}{}” nhưng thêm chữ “d” vào đi nhé ! tức là “\dfrac{}{}” thì sẽ đẹp hơn đó