Bonsoir
[tex]A=\dfrac{1}{3}\times4+\dfrac{7}{6}=\dfrac{4}{3}+\dfrac{7}{6}=\dfrac{8}{6}+\dfrac{7}{6}=\dfrac{15}{6}=\dfrac{5}{2}=2,5[/tex]
[tex]C=\dfrac{2\times10^{-5}\times1,2\times10^2}{3\times10^{-7}}=\dfrac{2\times1,2}{3}\times\dfrac{10^{-5}\times10^2}{10^{-7}}\\\\=\dfrac{2,4}{3}\times\dfrac{10^{-5+2}}{10^{-7}}=0,8\times\dfrac{10^{-3}}{10^{-7}}=0,8\times10^{-3-(-7)}=0,8\times10^{-3+7}\\\\=0,8\times10^{4}=8\times10^{-1}\times10^{4}=8\times10^{-1+4}=8\times10^3[/tex]
