(1.75·2/5+1.75:1)·1 5/7 = 4.2
1) 1.75·2/5 = 1.75·0.4 = 0.7
2) 1.75:1 = 1.75
3) 0.7 + 1.75 = 2.45
4) 2.45 ·1 5/7 = 245/100 · 12/7 = 49/20· 12/7 = 21/5 = 4 1/5 = 4.2
(17/40-0,325):1/5·0,4 = 0.1
1) 17/40-0,325 = 17/40-3/8 = 17/40-15/40 = 2/40 = 1/20 = 0.05
2) 1/20 :1/5 = 5/20 = 1/4 = 0.25
3) 1/4·0,4 = 1/4·2/5 = 1/10 = 0.1