(1/2 + 2/3) : (3/4 -3/5)= 2 1/3 x 6 - 3 1/3 : 2 1/6= 5/7 x 4 2/3 + 5/6 : 1 1/9= (2 1/4 - 1 2/3) : ( 1/6 + 2/9)= (3 1/2 : 2 4/5 - 9/4) x 2 2/3=

1) (1/2*3+2/3*2):(3/4*5-3/5*4)= (3/6+4/6):(15/20-12/20)= 7/ 6:3/20=7/2:1/20= 7/2*20/7=20/2=10 2) 7/3*6/1-7/3:21/6= 7/1*2/1-7/1:7/6=14/1-1/1*6/1=14-6=8 3) 5/7*14/3+5/6:11/9=5/1*2/3+5/6*9/11= 10/3+15/22=5/1+5/11=10/3+5/22=5/1+5/11=5/1*11+5/11=55/11+5/11=60/11=5 5/11 4) (9/4-5/3):(1/6+2/9)= (3/4-5/1):(1/3+1/9)= (3/4+5/1*4):(1/3*3+1/9)= (3/4+20/4):(3/9+1/9)= 23/4:4/9= 23/4*9/4=207/16=12 15/16 5) (7/2:14/5-9/4)*8/3= (7/2*5/14-9/4)*8/3= (1/2*5/2-9/4)*8/3= (5/4-9/4)*8/3= 4/4*8/3= 1*8/3=8/3=2 2/3 * razy