笔算下面各题.66÷8= 32÷6=45÷7=62÷9=28÷4=
=========
++﹣+﹣+﹣.
1﹣.
直接写得数.+ 2+ 1﹣ ++3﹣ + ﹣ ﹣﹣.
= =+= 1﹣= ﹣ +=1+ = 1﹣ =.