a) 3 1/5 + 4 7/8 = 15/5 +39/8 = 120/40+ 195/40=315/40 = 7 35/40 =7 7/8
b) 2 1/3 × 2/7 =7/3*2/7= 3/2= 1 1/2
c) 2,4 ÷ 2/5 = 2 2/5 :2/5 = 12/5 :2/5=12/5*5/2=6
d)12,08 ÷ 1000 =0.01208
e) 1,2 × 100 = 120
f) 1 1/7 nie rozumiem
g) 2,8 × 100 =280
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