Répondre :
a) (1/2)+(2/5)=(5/10)+(4/10)=9/10
b) 2+(5/2)=(4/2)+(5/2)=9/2
c) 1/((1/2)+(2/5))=1/(9/10)=10/9
d) (1/2)^2+(2/5)^2=(1/4)+(4/25)=(25/100)+(16/100)=41/100
1) B=V27+5V12-V300=V(3*9)+5V(3*4)-V(3*100)=3V3+5*2V3-10V3=3V3+10V3-10V3=3V3
b) 2+(5/2)=(4/2)+(5/2)=9/2
c) 1/((1/2)+(2/5))=1/(9/10)=10/9
d) (1/2)^2+(2/5)^2=(1/4)+(4/25)=(25/100)+(16/100)=41/100
1) B=V27+5V12-V300=V(3*9)+5V(3*4)-V(3*100)=3V3+5*2V3-10V3=3V3+10V3-10V3=3V3