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\(\text{ĐKXĐ: }x\ge0;x\ne\pm1\)
\(2\sqrt{144x+144}-3\sqrt{100x-100}=12\)
\(2\sqrt{144\left(x+1\right)}-3\sqrt{100\left(x-1\right)}=12\)
\(2\sqrt{144}.\sqrt{\left(x+1\right)}-3\sqrt{100}.\sqrt{x-1}=12\)
\(2.12\sqrt{x+1}-3.10\sqrt{x-1}=12\)
\(24\sqrt{x+1}-30\sqrt{x-1}=12\)
\(6.\left(4\sqrt{x+1}-5\sqrt{x-1}\right)=6.2\)
\(4\sqrt{x+1}-5\sqrt{x-1}=2\)
\(\text{Mk bí r}\)
\(\frac{144}{x+2}-\frac{100}{x}=2\)
\(\frac{144}{x-2}.x\left(x+2\right)-\frac{100}{x}.x\left(x+2\right)=2.x\left(x+2\right)\)
144x - 100(x + 2) = 2.x(x + 2)
x = 10
=> x = 10
K chắc nhá :w
\(ĐK:x\ne-2;x\ne0\)
\(\frac{144}{x+2}-\frac{100}{x}=2\)
\(\Leftrightarrow\frac{144}{x+2}-\frac{100}{x}-2=0\Leftrightarrow\frac{144x-100x-200-2x^2-4x}{\left(x+2\right)x}=0\)
\(\Leftrightarrow\frac{40x-2x^2-200}{\left(x+2\right)x}=0\Leftrightarrow40x-2x^2-200=0\Leftrightarrow20x-x^2-200=0\)
\(\Leftrightarrow-\left(20x-x^2-200\right)=0\Leftrightarrow x^2-20x+200=0\)
\(\Leftrightarrow\left(x-10\right)^2+100=0\left(\text{vô lí}\right)\)
\(\text{Vậy: pt vô nghiệm}\)
\(100+2x=144\)
\(\Rightarrow100+x=144\)
\(\Rightarrow x=144-100=44\)
\(\Rightarrow x=\frac{44}{2}=22\)
\(\Rightarrow x=22\)
\(\sqrt{\dfrac{49}{100}}=\dfrac{7}{10}\\ \sqrt{\dfrac{144}{289}}=\dfrac{12}{17}\\ \dfrac{\sqrt{36}}{\sqrt{225}}=\dfrac{6}{15}=\dfrac{2}{5}\\ \dfrac{\sqrt{25}}{\sqrt{121}}=\dfrac{5}{11}\)
Áp dụng quy tắc khai phương một thương, hãy tính :
a) 9169−−−−√ = \(\sqrt{\dfrac{3^2}{13^2}}\) = \(\left|\dfrac{3}{13}\right|\) = \(\dfrac{3}{13}\)
b) 25144−−−−√ = \(\sqrt{\dfrac{5^2}{12^2}}\) = \(\left|\dfrac{5}{12}\right|\) = \(\dfrac{5}{12}\)
c) 1916−−−−√ = \(\sqrt{\dfrac{25}{16}}\) = \(\sqrt{\dfrac{5^2}{4^2}}\) = \(\left|\dfrac{5}{4}\right|\) = \(\dfrac{5}{4}\)
d) 2781−−−−√ = \(\sqrt{\dfrac{169}{81}}\) = \(\sqrt{\dfrac{13^2}{9^2}}\) = \(\left|\dfrac{13}{9}\right|\) = \(\dfrac{13}{9}\)
\(2\sqrt{144}+\sqrt{100}-\sqrt{81}\)
\(=2\sqrt{12^2}+\sqrt{10^2}-\sqrt{9^2}\)
\(=2.12+10-9\)
\(=25\)