Đáp án:
e) 0
Giải thích các bước giải:
\(\begin{array}{l}
a)\dfrac{3}{5} - \dfrac{{17}}{{45}} = \dfrac{{27 - 17}}{{45}} = \dfrac{{10}}{{45}} = \dfrac{2}{9}\\
b) - \dfrac{4}{{15}} - \dfrac{{18}}{{19}} - \dfrac{{20}}{{19}} - \dfrac{{11}}{{15}} = - 1 - \dfrac{{38}}{{19}}\\
= - 1 - 2 = - 3\\
c)\dfrac{{\dfrac{8}{8} - \dfrac{8}{7} + \dfrac{8}{{11}} + \dfrac{8}{{15}}}}{{\dfrac{7}{8} - \dfrac{7}{7} + \dfrac{7}{{11}} + \dfrac{7}{{15}}}} = 8.\left( {\dfrac{1}{8} - \dfrac{1}{7} + \dfrac{1}{{11}} + \dfrac{1}{{15}}} \right):7.\left( {\dfrac{1}{8} - \dfrac{1}{7} + \dfrac{1}{{11}} + \dfrac{1}{{15}}} \right)\\
= \dfrac{8}{7}\\
d)\dfrac{2}{3} - \dfrac{7}{{24}} = \dfrac{{16 - 7}}{{24}} = \dfrac{9}{{24}} = \dfrac{3}{8}\\
e) - \dfrac{3}{{17}} - \dfrac{2}{{13}} + \dfrac{{20}}{{17}} - \dfrac{{11}}{3} = \dfrac{{17}}{{17}} - \dfrac{{13}}{{13}} = 0
\end{array}\)
