Question

8,(7) - 3,(2)=?
11,(12) - 4,(23)=?
9,2(5)-6,1(3)=?
7,(8)-3,4(5)=?
0,(7)+0,(51)=??
Multumesc anticipat.

Answer 1

$\displaystyle 8,(7)-3,(2)= \frac{79}{9} - \frac{29}{9} = \frac{50}{9} \\ \\ 11,(12)-4,(23)= \frac{1101}{99} - \frac{419}{99} = \frac{682}{99} \\ \\ 9,2(5)-6,1(3)= \frac{833}{90} - \frac{552}{90} = \frac{281}{90} \\ \\ 7,(8)-3,4(5)= \frac{71}{9} - \frac{311}{90} = \frac{710}{90} - \frac{311}{90} = \frac{399}{90} = \frac{133}{30} \\ \\ 0,(7)+0,(51)= \frac{7}{9} + \frac{51}{99} = \frac{77}{99} + \frac{51}{99} = \frac{128}{99}$