18.5-(5.6+4.8)/1.3=18.5-(5.6-0.4+0.4+4.8)/1.3=18.5-(5.6-0.4)/1.3-(0.4+4.8)/1.3=18.5-5.2/1.3-5.2/1.3=18.5-4-4=10.5
18.5-(5.6+4.8)/1.3=18.5-10.4/1.3=18.5-8=10.5
要么(18.5×1.3-5.6-4.8)/1.3=13.65/1.3=10.5如何?