1.
=6×1/9-11/3=2/3-11/3=-9/3=-3
2.
=а(а+4)/(а+4)^2=а/(а+4)
3.
=5аб/а(5б-8а)=5б/(5б-8а)=
=5×8/(5×8-8×3)=40/(40-24)=40/16=
=5/2=2.5
4.
=у(х+у)/15х ×3х/(х+у)=у/5=7.5/5=1.5
5.
=(15х^2-5х(3х-2))/(3х-2)=
=(15х^2-15х^2+10х)/(3х-2)=
=10х/(3х-2)=10×0.5/(3×0.5-2)=
=5/(-0.5)=-10
6.
=27(б^2+4б+4)/б ÷(6+3б)/б=
=27б(б+2)^2/3б(2+б)=9(б+2)=
=9(-4/9+2)=9×(-14/9)=-14