沿一个正方形鱼塘的四周栽树一行,四个角上都栽一棵,共种树苗52棵,每边栽树 棵.
=12÷ == :24= %
6÷ ==37.5%=12: =.
=12÷ =0.25=4: = %
1÷4==4: = %= (小数)
==6﹣ = ÷= 折.