1) 4,4-4,15+1.7/15+7/60=4.4/10-4.15/100+1.7/15+7/60=(4-4+1)+(4/10-15/100+7/15+7/60)= нок(10,100,15,60)=300 значит = 1.120-45+140+35/300=1.250/300 сокращаем на 50 =1.5/6
2) 1.5/6:3.2/3=11/6:11/3=11/6*3/11=1/2
3) 3.1/2-2,75=3.1/2-2.75/100=(3-2)+(1/2-75/100)= нок (2и100)=100 значит = 1.50-75/100= 100+50-75/100=75/100 сокращаем на 25 =3/4
4) 3/4:0,2=3/4:2/10=3/4*10/2=15/4=3.3/4
5) 3.3/4-2.1/2=(3-2)+(3/4-1/2)=1.1/4
6) 1/2:1.1/4=1/2:5/4=1/2*4/5=2/5 или =0,4