4 3/5+2,6- 5 1/2

Interpret the expression as: 4 3/5 + 2,6 − 5 1/2 (here 2,6 means 2.6).

Option 1 (decimals):

• 4 3/5 = 4.6
• 2,6 = 2.6
• 5 1/2 = 5.5 Compute: 4.6 + 2.6 − 5.5 = 7.2 − 5.5 = 1.7

Option 2 (fractions):

• 4 3/5 = 23/5
• 2,6 = 13/5
• 5 1/2 = 11/2 Compute: (23/5 + 13/5) − 11/2 = 36/5 − 11/2 = (72 − 55)/10 = 17/10 = 1 7/10

Answer: 1.7 (or 17/10, i.e., 1 7/10).