李小兰家用100粒玉米做发芽实验,结果有98粒发芽,发芽数与总数的比是 ,没发芽数与发芽数的比是 .
= :16=12: = ÷ = 填小数.
=15÷ = :50=.
1.5: =0.75=75÷ = :36=.
:12=5÷4== %= (填小数).
3÷4=9: == 填分数= (填小写)