梯形的高=梯形的面积÷(上底+下底)×2. (判断对错)
9÷ = :48=0.75= %= 折数.
:12=6÷ = 填小数= 折=75%.
=0.4==12÷ = %= :25.
= (小数)= (百分数)=12: = 折.
0.75== ÷16=27: = %.