№ 1 на фото
№ 1 1) 4:(16/19)=4*(19/16)=19/4=4(3/4), 2) (5/12)-3(13/24)=(10/24)-3(13/24)=-3(3/24)=-3(1/8), 3) 3(3/5)*(-3(1/8))=(18/5)*(-25/8)=-45/4=-11(1/4), 4) 4(3/4)-11(1/4)=-(11(1/4)-4(3/4))=-(10(5/4)-4(3/4))=-6(2/4)= =-6(1/2)=-6,5.