Răspuns:
x + y = - 1/8
Explicație pas cu pas:
x = - 0,1(6) + 7/8 - 0,08(3)
= - (16 - 1)/90 + 7/8 - (83 - 8)/900
= - 15⁽¹⁵/90 + 7/8 - 75⁽⁷⁵/900
= - ⁴⁾1/6 + ³⁾7/8 - ²⁾1/12
= ( - 4 + 21 - 2)/24
= 15⁽³/24 = 5/8
y = - 3,1(6) + (3ₓ8 + 7)/8 - 1,08(3)
= - (316 - 31)/90 + 31/8 - (1083 - 108)/900
= - 285⁽¹⁵/90 + 31/8 - 975⁽⁷⁵/900
= - ⁴⁾19/6 + ³⁾31/8 - ²⁾13/12
= (- 76 + 93 - 26)/12
= - 9⁽³/12 = - 3/4
x + y = 5/8 + ( - ²⁾3/4) = (5 - 6)/8 = - 1/8
