17.52-9.87+3.65 92.3-（84.54-45.65） 55.24-(16.38+7.88) 14.52-8.68+7.75
45-0.35+6.93 7.4+(5.96-3.86) 12.89+8.56+0.15 3.2+6.27-5.88 10-(2.75+0.84) 19.92+14.4-9.921 5.8-0.75-4.25 8.75-(2.75+3)
4.8-1.25+2.75 85.7-(15.3-4.8) 40-(2.75+0.86) 9.5+4.85-6.13
3.65+7.25-5.8 8.5+7.6-8.5+2.4 (2.524+1.389)-(0.524+1.389) 18.5-(8.5+7.9)