Đáp án:
C1:
a) 0
Giải thích các bước giải:
\(\begin{array}{l}
C1:\\
a)\dfrac{{11 + 13}}{{24}} - \dfrac{{5 + 36}}{{41}} = 1 - 1 = 0\\
b)\left( {23 + \dfrac{1}{4} - 13 - \dfrac{1}{4}} \right).\dfrac{7}{5}\\
= 10.\dfrac{7}{5} = 14\\
c)\dfrac{2}{5} + \dfrac{{ - 3}}{{20}} = \dfrac{{8 - 3}}{{20}} = \dfrac{5}{{20}} = \dfrac{1}{4}\\
d)\dfrac{{29}}{{10}} + 5 - \dfrac{{21}}{5} - \dfrac{{29}}{{10}} + \dfrac{{21}}{5} = 5\\
C2:\\
a)x = \dfrac{9}{{10}}:\left( { - \dfrac{3}{5}} \right)\\
\to x = - \dfrac{3}{2}\\
c)7x = 419 - 25\\
\to 7x = 394\\
\to x = \dfrac{{394}}{7}
\end{array}\)
