(3 1/3+5 1/6)*2/5-2 3/4:(1 1/2-2/5) ; 3 1/3*2 2/5*(2-4 8/15*3/17) ;
(1/8+2/9-1/4)*5 1/7:(7/9-2/3+1/6) ; (10 3/4-12 :1 1/5)*4/9+2 1/6+3 1/4:5 1/5