Thực hiện phép tính:
a. \(\dfrac{7}{{23}}.\left[ {\left( { - \dfrac{8}{6}} \right) - \dfrac{{45}}{{18}}} \right]\)
b. \(\left( {\dfrac{{ - 2}}{3} + \dfrac{3}{7}} \right):\dfrac{4}{5} + \left( {\dfrac{{ - 1}}{3} + \dfrac{4}{7}} \right):\dfrac{4}{5}\)
c. \( - \dfrac{8}{3} + \left( {\dfrac{2}{3} - 1 + \dfrac{1}{2}} \right) - \left( { - \dfrac{5}{4} + \dfrac{1}{2}} \right)\)
A.a) \(-\dfrac{7}{6}\)
b) \(0\)
c) \(-\dfrac{7}{4}\)
B.a) \( \dfrac{7}{6}\)
b) \(0\)
c) \(-\dfrac{7}{4}\)
C.a) \(-\dfrac{7}{6}\)
b) \(1\)
c) \(\dfrac{7}{4}\)
D.a) \(-\dfrac{7}{6}\)
b) \(\dfrac{4}{3}\)
c) \(-\dfrac{7}{4}\)
a. \(\dfrac{7}{{23}}.\left[ {\left( { - \dfrac{8}{6}} \right) - \dfrac{{45}}{{18}}} \right]\)
b. \(\left( {\dfrac{{ - 2}}{3} + \dfrac{3}{7}} \right):\dfrac{4}{5} + \left( {\dfrac{{ - 1}}{3} + \dfrac{4}{7}} \right):\dfrac{4}{5}\)
c. \( - \dfrac{8}{3} + \left( {\dfrac{2}{3} - 1 + \dfrac{1}{2}} \right) - \left( { - \dfrac{5}{4} + \dfrac{1}{2}} \right)\)
A.a) \(-\dfrac{7}{6}\)
b) \(0\)
c) \(-\dfrac{7}{4}\)
B.a) \( \dfrac{7}{6}\)
b) \(0\)
c) \(-\dfrac{7}{4}\)
C.a) \(-\dfrac{7}{6}\)
b) \(1\)
c) \(\dfrac{7}{4}\)
D.a) \(-\dfrac{7}{6}\)
b) \(\dfrac{4}{3}\)
c) \(-\dfrac{7}{4}\)
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