0.75立方分米= 立方厘米;450平方分米= 平方米; 小时= 分 2.5时= 分.
=15÷ = :50=.
1.5: =0.75=75÷ = :36=.
:12=5÷4== %= (填小数).
3÷4=9: == 填分数= (填小写)
9: =0.75==21÷ = :4.