Question

2,1(6)-1,(6) ajutatima

Answer 1

$2.1(6) - 1.(6) = \\ \frac{216 - 21}{90} - \frac{16 - 1}{9} = \\ \frac{195}{90} - \frac{15}{9} = \\ \frac{195}{90} - \frac{150}{90} = \frac{195 - 150}{90} = \frac{45}{90} = \frac{1}{2}$

Answer 2

2,1(6) = (216-21)/90 = 195/90 = 13/6 1,(6) = (16-1)/9 = 15/9 = 5/3 => 13/6 - 5/3 = (13-10)/6 = 3/6 = 1/2  Numitorul comun este 6. Am amplificat prima fractie cu 1, iar cea de-a doua cu 2.