Справа налево:

2 || 2 = 1

2 + 1 = 3

2 || 2 = 1

3 || 1 = 0,75

2 + 0,75 + 2 = 4,75

2 || 2 = 1

1 || 4,75 = 0,8260869565217

2 + 0,8260869565217+2 = 4,826086956522 Ом