黑板上下两条边互相 ,上面的边和左边的边互相 .
在括号里填上合适的数.3÷8=9÷ === (填小数)
= :16=12: = ÷ = 填小数.
=15÷ = :50=.
1.5: =0.75=75÷ = :36=.
:12=5÷4== %= (填小数).