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\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}\)
\(=\frac{27}{182}-\frac{1}{182}\)
\(=\frac{1}{7}\)
\(\frac{3}{5}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)
\(=\frac{6}{10}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)
\(=\frac{1}{10}.\frac{78}{46}-\frac{1}{10}.\frac{16}{32}\)
\(=\frac{1}{10}\left(\frac{78}{46}-\frac{32}{46}\right)\)
\(=\frac{1}{10}.1=\frac{1}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{3}{7}.\dfrac{9}{36}-\dfrac{1}{14}.\dfrac{1}{13}\)
\(=\dfrac{3.9}{7.36}-\dfrac{1.1}{14.13}\)
\(=\dfrac{3}{28}-\dfrac{1}{182}=\dfrac{37}{364}\)
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đầu bài là như này đúng không hả bạn
\(\frac{1}{2}+\frac{2}{3}:\left(x-1\right)\)\(=\frac{3}{4}\)
Ta có :\(\frac{1}{2}+\frac{2}{3}:\left(x-1\right)\)\(=\frac{3}{4}\)
\(\frac{2}{3}:\left(x-1\right)\)\(=\frac{1}{4}\)
\(\left(x-1\right)\)\(=\frac{8}{3}\)
\(x=\frac{11}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
bấm máy tính đi :D
= 27/182 - 1/182
= 26/182
= 1/7