13-6=..................
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
7 + 6 = 13 13 – 5 = 8 |
6 + 7 = 13 13 – 8 = 5 |
13 – 7 = 6 13 – 4 = 9 |
13 – 6 = 7 13 – 9 = 4 |
![](https://rs.olm.vn/images/avt/0.png?1311)
Sửa đề: 7/13 : 6/11 - 7/13 : 6/5 + 6/13
7/13 : 6/11 - 7/13 : 6/5 + 6/13
= 7/13 . 11/6 - 7/13 . 5/6 + 6/13
= 7/13 . (11/6 - 5/6) + 6/13
= 7/13 . 1 + 6/13
= 7/13 + 6/13
= 1
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{6}{7}.\frac{8}{13}+\frac{6}{7}.\frac{9}{13}-\frac{3}{13}.\frac{6}{7}\)
\(=\frac{6}{7}.\left(\frac{8}{13}+\frac{9}{13}-\frac{3}{13}\right)\)
\(=\frac{6}{7}.\frac{8+9-3}{13}\) .................. Đúng 100% .................
\(=\frac{6}{7}.\frac{14}{13}\) ......................... Tk mik nha 😙😙😙 ...........................
\(=\frac{12}{13}\)
=6/7.(8/13+9/13-3/13)
=6/7.14/13
=84/91
Bài cứ sai sai thế nào ý
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{12}{17}.\dfrac{9}{13}-\dfrac{7}{15}.\dfrac{6}{13}+\dfrac{5}{17}.\dfrac{9}{13}-\dfrac{8}{15}.\dfrac{6}{13}\)
\(=\dfrac{9}{13}.\left(\dfrac{12}{17}+\dfrac{5}{17}\right)-\dfrac{6}{13}.\left(\dfrac{7}{15}+\dfrac{8}{15}\right)\)
\(=\dfrac{9}{13}.\dfrac{17}{17}-\dfrac{6}{13}.\dfrac{15}{15}\)
\(=\dfrac{9}{13}.1-\dfrac{6}{13}.1\)
\(=\dfrac{9}{13}-\dfrac{6}{13}\)
\(=\dfrac{9-6}{13}\)
\(=\dfrac{3}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{6}{13}.\dfrac{8}{7}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{3}{13}.\dfrac{6}{7}=\dfrac{6}{13}.\left(\dfrac{8}{7}+\dfrac{9}{7}\right)-\dfrac{3}{13}.\dfrac{6}{7}=\dfrac{6}{13}.\dfrac{17}{7}-\dfrac{3}{13}.\dfrac{6}{7}=\dfrac{102}{91}-\dfrac{18}{91}=\dfrac{12}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{6}{{13}}.\dfrac{8}{{7}}.\dfrac{{ - 26}}{3}.\dfrac{{ - 7}}{8}\)
\(\begin{array}{l} = \left( {\dfrac{6}{{13}}.\dfrac{{ - 26}}{3}} \right).\left( {\dfrac{8}{7}.\dfrac{{ - 7}}{8}} \right)\\ = \dfrac{{6.\left( { - 26} \right)}}{{13.3}}.\dfrac{{8.\left( { - 7} \right)}}{{7.8}}\\= (- 4).\left( { - 1} \right) = 4\end{array}\)
b) \(\dfrac{6}{5}.\dfrac{3}{{13}} - \dfrac{6}{5}.\dfrac{{16}}{{13}}\)
\(\begin{array}{l} = \dfrac{6}{5}.\left( {\dfrac{3}{{13}} - \dfrac{{16}}{{13}}} \right)\\ = \dfrac{6}{5}.\dfrac{{3 - 16}}{{13}}\\ = \dfrac{6}{5}.\dfrac{{-13}}{{13}}\\= \dfrac{6}{5}.\left( { - 1} \right)\\ = \dfrac{{ - 6}}{5}\end{array}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{6}{7}x\frac{8}{13}+\frac{6}{13}x\frac{9}{7}-\frac{3}{13}x\frac{6}{7}\)
= \(\frac{48}{91}\) + \(\frac{54}{91}\) - \(\frac{18}{91}\)
= \(\frac{84}{91}\)
= \(\frac{12}{13}\)
k nha mk nhanh nhất
13 - 6 = 7 nha
~HT~
13 - 6 = 7