Đáp án:
a) \(\dfrac{1}{2}\)
Giải thích các bước giải:
\(\begin{array}{l}
a){7^{10}}.\dfrac{1}{{{7^{10}}}} - \dfrac{3}{6} = 1 - \dfrac{3}{6} = \dfrac{3}{6} = \dfrac{1}{2}\\
b)3,4 + 4.7.2 - 3,4 = 4.7.2 = 56\\
c)25.\left( { - \dfrac{1}{{27}}} \right) + \dfrac{1}{5} - 2.\dfrac{1}{2} - \dfrac{1}{2}\\
= - \dfrac{{25}}{{27}} + \dfrac{1}{5} - \dfrac{3}{2} = - \dfrac{{98}}{{135}} - \dfrac{3}{2} = - \dfrac{{601}}{{270}}
\end{array}\)
