用竖式计算372÷69= 536÷76= 183÷30= 243÷42= 204÷24= 340÷56=
==+=1﹣= ﹣ +=1+ = 1﹣ =.
三(1)班男生占全班人数的,女生占全班人数的几分之几?
+ =+ = = 改正: