Calculati rationalizand

Explicație pas cu pas:
1/(V7+V5)+1/(V5+V3)+1/(V7+V3)=
(V7-V5)/2+(V5-V3)/2+(V7-V3)/4=
2(V7-V5)/4+2(V5-V3)/4+(V7-V3)/4=
(2V7-2V5+2V5-2V3+V7-V3)/4=
(3V7-3V3)/4=3(V7-V3)/4