Question

dau coroana.
1,(6)÷(1,25+0,8(3));
(0,25+0,2(7))÷6,(3)

Answer 1

1,(6):[1,25+0,8(3)] = (16-1)/9 : [125/100 + (83-8)/90] = 15/9 :(5/4 + 75/90) =

= 5/3 : (³⁾5/4 + ²⁾5/6) = 5/3: [(15+10)/12] = 5/3 : 25/12 = 5/3 x 12/25 = 4/5 = 0,8

(0,25+0,2(7))÷6,(3) = [1/4 + (27-2)/90] : (63-6)/9 = [⁴⁵⁾1/4+²⁾25/90]:(57/9) =

= [(45+50)/180] : (57/9) = 95/180 x 9/57 = 19/(4x57) = 1/(4x3) = 1/12 = 0,08(3)