Răspuns:
Explicație pas cu pas:
a)
1,5 + x = -7,5
x = -7,5 - 1,5 = -9
b)
11/4 + y = 3
y = 3 - 11/4 = 12/4 - 11/4 = 1/4
c)
z + 0,(3) = 2/3
z + 3/9 = 2/3
z = 2/3 - 3/9 = 2/3 - 1/3 = 1/3
d)
y - 5/6 = 1/2
y = 1/2 + 5/6 = 3/6 + 5/6 = 8/6 = 4/3
e)
-7/2*x = 0,5
x = -0,5 : 7/2 = -5/10 : 7/2 = -1/2 : 7/2 = -1/2*2/7 = -1/7
f)
a - 0,2(3) = 4/15
0,2(3) = (23 - 2)/90 = 21/90 = 7/30
a = 4/15 + 7/30 = 8/30 + 7/30 = 15/30 = 1/2
