(1) 54.76 - 51.12 =(3) 59.46 + 18.28 =(5) 21.85 + 37.08 =(7) 84.75 + 21.4 = (8）12.3+23.8=(9）12.9+ 45.6= (10)1.23+6.52= (11)5.32-0.93= (12)4.26+8.21= (13)6.35-5.23= （14）1.23+5.69=（15）1....