17.52-9.87+3.6592.3-（84.54-45.65）55.24-(16.38+7.88)14.52-8.68+7.75

　　45-0.35+6.937.4+(5.96-3.86)12.89+8.56+0.153.2+6.27-5.8810-(2.75+0.84)19.92+14.4-9.9215.8-0.75-4.258.75-(2.75+3)

　　4.8-1.25+2.7585.7-(15.3-4.8)40-(2.75+0.86)9.5+4.85-6.13

　　3.65+7.25-5.88.5+7.6-8.5+2.4(2.524+1.389)-(0.524+1.389)18.5-(8.5+7.9)