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0,35A=350mA
0,5V=500mV
6kV=6000V

\(\dfrac{2}{5}+\dfrac{20}{30}=\dfrac{12}{30}+\dfrac{20}{30}=\dfrac{32}{30}=\dfrac{16}{15}\)

\(a.x=\dfrac{9}{4}-\dfrac{7}{16}=\dfrac{36}{16}-\dfrac{7}{16}=\dfrac{29}{16}\)
b.\(x=\dfrac{1}{5}:\dfrac{7}{9}=\dfrac{9}{35}\)
c.\(x=\dfrac{2}{5}:\dfrac{4}{9}=\dfrac{9}{10}\)
d.\(x=\dfrac{15}{2}-\dfrac{7}{3}=\dfrac{31}{6}\)