Ex.6. a. X=2x1/2-3x1/3+4x1/4 = 1
b.X=2x1/4-3x1/12+4x1/16 =2/4
Ex.7. a=0,25 c=0,1(3)-b b=0,1,(3)-c Si apoi inlocuesti
Ex.8. a=0,75 b=0,1(6)-c. c=-0,1(6)+b. Si apoi inlocuesti
Ex.9. a. X=2/3x3/4 +2/3x5/6 +3/4x5/6 =121/72
b.X=0,(2)x0,(4)+0,(2)x0,(18)+0,(4)x0,(18)=2/9x4/9+2/9x18/99+4/9x18/99 Calculezi si dai factor com un dupa,e user de aici
