Tính giá trị biểu thức:a) \({\rm{A}} = \left( {6:\dfrac{3}{5} - 1\dfrac{1}{6} \times \dfrac{6}{7}}
Tính giá trị biểu thức:
a) \({\rm{A}} = \left( {6:\dfrac{3}{5} - 1\dfrac{1}{6} \times \dfrac{6}{7}} \right):\left( {4\dfrac{1}{5} \times \dfrac{{10}}{{11}} + 5\dfrac{2}{{11}}} \right)\)
b) \({\rm{B}} = \left( {\dfrac{3}{{20}} + \dfrac{1}{2} - \dfrac{1}{{15}}} \right) \times \dfrac{{12}}{{49}}:\left( {3\dfrac{1}{3} + \dfrac{2}{9}} \right)\)
a) \({\rm{A}} = \left( {6:\dfrac{3}{5} - 1\dfrac{1}{6} \times \dfrac{6}{7}} \right):\left( {4\dfrac{1}{5} \times \dfrac{{10}}{{11}} + 5\dfrac{2}{{11}}} \right)\)
\({\rm{A}} = \left( {6 \times \dfrac{5}{3} - \dfrac{7}{6} \times \dfrac{6}{7}} \right):\left( {\dfrac{{21}}{5} \times \dfrac{{10}}{{11}} + \dfrac{{57}}{{11}}} \right)\)
\({\rm{A}} = \left( {10 - 1} \right):\left( {\dfrac{{42}}{{11}} + \dfrac{{57}}{{11}}} \right)\)
\({\rm{A}} = 9:\dfrac{{99}}{{11}}\)
\({\rm{A}} = \dfrac{{99}}{{99}} = 1\)
b) \({\rm{B}} = \left( {\dfrac{3}{{20}} + \dfrac{1}{2} - \dfrac{1}{{15}}} \right) \times \dfrac{{12}}{{49}}:\left( {3\dfrac{1}{3} + \dfrac{2}{9}} \right)\)
\({\rm{B}} = \left( {\dfrac{9}{{60}} + \dfrac{{30}}{{60}} - \dfrac{4}{{60}}} \right) \times \dfrac{{12}}{{49}}:\left( {\dfrac{{10}}{3} + \dfrac{2}{9}} \right)\)
\({\rm{B}} = \dfrac{7}{{12}} \times \dfrac{{12}}{{49}}:\left( {\dfrac{{30}}{9} + \dfrac{2}{9}} \right)\)
\({\rm{B}} = \dfrac{1}{7}:\dfrac{{32}}{9}\)
\({\rm{B}} = = \dfrac{1}{7} \times \dfrac{9}{{32}}\)
\(B = \dfrac{9}{{224}}\)
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