Răspuns:
Explicație pas cu pas:
a) 1,5 + x = -7,5 => x = -7,5-1,5 => x = -9
b) 11/4 + y = 3 => y = ⁴⁾3-11/4 => y = (12-11)/4 => y = 1/4
c) z + 0,(3) = 2/3 <=> z = 2/3 - 1/3 => z = 1/3
d) y-5/6 = 1/2 => y = 5/6+³⁾1/2 = (5+3)/6 = 8/6 => y = 4/3
e) -7/2-x = 0,5 => x = -7/2-1/2 = (-7-1)/2 = -8/2 => x = -4
f) a-0,2(3)=4/15 => a = 4/15 + (23-2)/90 =>
a = 4/15+21/90 = ²⁾4/15+7/30 = (8+7)/30 = 15/30 => a = 1/2
