Sagot :
Il suffit juste de remplacer tes x par les images qu'on t'as donné et tu as les résultats
f(x)=2+(2x-1)/(3x+7)
f(2/3)=2+(2(2/3)-1)/(3(2/3)+7)=2+((4/3)-1)/(2+7)=2+((4/3)-(3/3))/9=2+(1/3)/9
=2+1/27=(2x27)/27+1/27=54/27+1/27=55/27
f(-7/9)=2+(2(-7/9)-1)/(3(-7/9)+7)=2+((-14/9)-1)/((-21/9)+7)
=2+((-14/9)-9/9)/((-21/9)+63/9)=2+(-23/9)/(42/9)=2-23/42=2x42/42-23/42
=84/42-23/42=61/42
f(-3/14)=2+(2(-3/14)-1)/(3(-3/14)+7)=2+((-6/14)-14/14)/((-9/14+98/14)
=2+(-20/14)/(89/14)=2-20/89=2x89/89-20/89=178/89-20/89=158/89