Б) 27/90=9/9×3/10=3/10=0,3 ;24/120=12/12×2/10=2/10=0,2; 24/40=8/8×3/5=3/5=0,6 ; 48/60=12/12×4/5=4/5=0,8 ;в)15/500=5/5×3/100=3/100=0,03; 160/4000=40/40×4/100=4/100=0,04; 36/900=9/9×4/100=4/100=0,4 ;140/700=140/140×1/5=1/5=0,2 ;г)11/11000=11/11×1/1000=0,001 ; 81/3000=3/3×27/1000=27/1000=0,027 ;144/4000=4/4×36/1000=36/1000=0,036