Question

Calculati:
a)$(\frac{2}{3})^{0} +(\frac{2}{3})^1+(\frac{2}{3})^2$
b)$[(\frac{2}{3})^2]^5:(\frac{2}{3})^7$

 

Answer 1

a)(2/3)⁰=1
   (2/3)¹=2/3
   (2/3)²=(2²)/(3²)=4/9
   1+2/3+4/9=
   Numitor comun este 9
   (9+6+4)/9=
   19/9

b)(2/3)²ˣ⁵:(2/3)⁷=
   (2/3)¹⁰:(2/3)⁷=
   (2/3)¹⁰⁻⁷=
   (2/3)³=
   (2³)/(3³)=
   8/27