8.23加6.5减8.23加6.5简便算法 1.27加3.9加(9.33减4.5)简便算法 22.78减（4.97加2.23）加4.02简便计算

8.23+6.5-8.23+6.5=(8.23-8.23)+(6.5+6.5)=131.27+3.9+(9.33-4.5)=1.27+3.9+9.33-4.5=(1.27+9.33)+3.9-4.5=10.6-4.5+3.9=6.1+3.9=1022.78-(4.97+2.23)+4.02=(22.78+4.02)-(4.97+2.23)=26.8-7.2=19.6