24× 24 ÷ 36÷ 36×
× = × ÷ × = ÷ =
8÷ = × = ×16=
( + )×72= × ÷ = 12÷ = ÷ =
①27× ﹣11
② ÷7+ ×
③ ×34×7×
④ ×4÷ ×4
⑤ ÷ ÷
⑥15÷ ×
养殖场有鸡3200只,第一周卖出 ,第二周卖出 .