Rút gọn \(\frac{66x23x11}{11x13x33}\)
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\(\frac{1}{3-\sqrt{7}}-\frac{1}{3+\sqrt{7}}=\frac{3+\sqrt{7}}{\left(3-\sqrt{7}\right)\left(3+\sqrt{7}\right)}-\frac{3-\sqrt{7}}{\left(3-\sqrt{7}\right)\left(3+\sqrt{7}\right)}\)
\(=\frac{3+\sqrt{7}-3+\sqrt{7}}{\left(3-\sqrt{7}\right)\left(3+\sqrt{7}\right)}=\frac{2\sqrt{7}}{9-7}=\sqrt{7}\)
a, \(\frac{1}{3-\sqrt{7}}-\frac{1}{3+\sqrt{7}}=\frac{3+\sqrt[]{7}-3+\sqrt{7}}{\left(3-\sqrt{7}\right)\left(3+\sqrt{7}\right)}\)
\(=\frac{2\sqrt{7}}{9-7}=\sqrt{7}\)
\(\frac{191919}{373737}=\frac{191919:10101}{373737:10101}=\frac{19}{37}\)
Ta có: \(\frac{{ - 18}}{{76}} = \frac{{ - 18:2}}{{76:2}} = \frac{{ - 9}}{{38}}\)
\(\frac{{125}}{{ - 375}} = \frac{{125:( - 125)}}{{ - 375:( - 125)}} = \frac{{ - 1}}{3}\)
\(-\dfrac{18}{76}=\dfrac{-9}{38};\dfrac{125}{-375}=-\dfrac{1}{3}\)
$\frac{{15}}{6} = \frac{{15:3}}{{6:3}} = \frac{5}{2}$
$\frac{{12}}{{16}} = \frac{{12:4}}{{16:4}} = \frac{3}{4}$
$\frac{{35}}{{105}} = \frac{{35:35}}{{105:35}} = \frac{1}{3}$
\(\frac{66\times23\times11}{11\times13\times33}=\frac{33\times2\times23\times11}{11\times13\times33}=\frac{2\times23}{13}=\frac{46}{13}\)
46/13 tick cho minh nha