看谁算的又对又快.3.4+0.34= 0.12+13= 56﹣2.3= 20000﹣511= 7.12+16= 1.3+38=
连减。77-56-6=78-27-36=
连减。88-12-51=79-19-26=
连减。65-56-3=86-35-24=
连减。67-21-22=68-45-18=
连减。72-33-12=54-27-18=