Question

Answer 1

a: \(\dfrac{2}{5}-\dfrac{-12}{5}=\dfrac{2}{5}+\dfrac{12}{5}=\dfrac{14}{5}\)

b: \(\left(\dfrac{5}{6}-\dfrac{1}{4}\right):\left(\dfrac{1}{2}+\dfrac{2}{3}\right)\)

\(=\dfrac{10-3}{12}:\dfrac{3+4}{6}\)

\(=\dfrac{7}{12}\cdot\dfrac{6}{7}=\dfrac{6}{12}=\dfrac{1}{2}\)

c: \(2,5\cdot\left(-0,124\right)+10,124\cdot2,5\)

\(=2,5\left(-0,124+10,124\right)\)

\(=2,5\cdot10=25\)

d: \(25\%\text{ }-1\dfrac{1}{2}:\left(-2022\right)^0+0,5\cdot\dfrac{12}{5}\)

\(=0,25-1,5+0,5\cdot2,4\)

=-1,25+1,2

=-0,05