Réponse :
a) (2/3)x+(5/4)x= x[(2/3)+(5/4)]
= (23/12)x
b) (2/3)x+(5/4)x= x[(2/3)*(5/4)]
= (5/6)x
c) (2/3)x-(5/4)x= x[(2/3)-(5/4)]
= (7/12)x
d) (2/3)x²+(5/4)x= (2/3)x+1x+(5/4)x
=x[(2/3)+1+(5/4)]
= (35/12)x
e) (2/3)x²*(5/4)x= (2/3)x*1x*(5/4)x
= x[(2/3)*1*(5/4)]
= (5/6)x
f) [(2/3)x]²= (2/3)x*(2/3)x
=x[(2/3)*(2/3)]
= (4/9)x
