oblicz.................. zadanie 2 tylko 2 pierwsze słupki

2/3+6/10=20/30+18/30=38/30=1 8/30 42/10-10/9=378/90-100/90=278/90=3 18/90 36/10-3/2=72/20-30/20=42/20=2 2/20 7/3:8/10=7/3*10/8=70/21=3 7/21 52/10*2/7=104/70=1 34/70 6/10:2/3=6/10*3/2=18/20