(1 5/18-2 4/27)*5,4х=9 1/2+2 1/4
(23/18-58/27)*54/10=4.25 1)23*3/54-58*2/54=-47/54 2)-47/54*54/10=-2538/540 4,7=4,25 4,7-4,25=0.45