(6 8/15-4 21/45)×4,5-2 1/6÷0,52

1) 6 8/15 -4 21/45 =98/15-201/45=294/45-201/45=93/45 2) 93/45*4,5=93/45*9/2=93/10 3) 2 1/6 :0,52= 13/6 :13/25=13/6*25/16=25/6 4) 93/10-25/6=279/30-125/30=154/30=5 4/30 =5 2/15