а) 14/30= 7/15
б)=3/2*40/10=60/10=6
в)=2/1 :7/8=2/1*8/7=16/7=2.2/7
г)=(5/20+12/5):2=17/20 :2/1=17/20*1/2=17/40
а)= 2/3-2/10=14/30 или 0,46
а) 14/30= 7/15
б)=3/2*40/10=60/10=6
в)=2/1 :7/8=2/1*8/7=16/7=2.2/7
г)=(5/20+12/5):2=17/20 :2/1=17/20*1/2=17/40
а)= 2/3-2/10=14/30 или 0,46
б)=3/2*40/10=60/10=6
в)=2/1 :7/8=2/1*8/7=16/7=2.2/7
г)=(5/20+12/5):2=17/20 :2/1=17/20*1/2=17/40