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= 38/7 - 17/5 × 7/1=
= 38/7 - 119/5=
= 175/35 - 833/35=
= -658/35 = -18,8
b) 3 i 4/5 + 2 i 5/12 ×6=
= 19/5 + 29/12 ×6/1=
=19/5 + 174/12=
= 228/60 + 870/60=
=1098/60 = 18,3
c) 3 i 1/4 :4+1 i 1/8×2=
= 13/4:4+9/8×2=
=13/4×1/4+9/8×2/1=
=13/16+18/8=
=13/16+36/16=
=49/16 =3,0625
Gdzie / to kreska ułamkowa czyli np 19/5 to dziewietnascie piątych
: to podzielić chyba wiadome
i x to pomnozyc :P