2,5 + 1 2/3 - 3 1/6 = 2.5 + 1.67 - 3.16 ≈ 1.01

а) x + 1 3/4 = 5 1/3
x = 5 1/3 - 1 3/4
x = 4 0/3 - 1 3/4
x = 2 2/12 - 1 9/12
x = 1 5/12

б) x - 4 5/8 = 3 1/2
x = 3 1/2 + 4 5/8
x = 3 4/8 + 4 5/8
x = 7 9/8