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7681
Đáp án:
\(\begin{array}{l}
a) - 4,345608149\\
c)\dfrac{{61}}{{234}}\\
b)14,50052083\\
d)\dfrac{{731}}{{480}}
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
a) - \dfrac{7}{{22}}:\left( {\dfrac{{17}}{{18}} - \dfrac{9}{{15}} - \dfrac{{12}}{{46}}} \right) - \dfrac{7}{{13}}\\
= - \dfrac{7}{{22}}:\left( {\dfrac{{31}}{{90}} - \dfrac{6}{{23}}} \right) - \dfrac{7}{{13}}\\
= - \dfrac{7}{{22}}:\dfrac{{173}}{{2070}} - \dfrac{7}{{13}}\\
= - 4,345608149\\
c) - \dfrac{4}{9}.\left( {\dfrac{1}{{26}} - \dfrac{{32}}{{64}} - \dfrac{4}{{32}}} \right)\\
= - \dfrac{4}{9}.\left( { - \dfrac{{61}}{{104}}} \right) = \dfrac{{61}}{{234}}\\
b)\dfrac{7}{{32}}.\left( { - \dfrac{9}{{12}} - \dfrac{{16}}{{30}}} \right) - \left( {\dfrac{7}{{32}} - 15} \right)\\
= \dfrac{7}{{32}}.\left( { - \dfrac{{77}}{{60}}} \right) - \left( { - \dfrac{{473}}{{32}}} \right)\\
= - \dfrac{{539}}{{1920}} + \dfrac{{473}}{{32}} = 14,50052083\\
d)\dfrac{{11}}{{32}}:\left( {\dfrac{{14}}{{18}} - \dfrac{{16}}{{27}}} \right) - \left( {\dfrac{2}{3} - \dfrac{5}{{15}}} \right)\\
= \dfrac{{11}}{{32}}:\dfrac{5}{{27}} - \dfrac{1}{3}\\
= \dfrac{{297}}{{160}} - \dfrac{1}{3} = \dfrac{{731}}{{480}}
\end{array}\)
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