如果两个梯形面积相等,那么它们一定等底等高. .(判断对错,对的打“√”,错的打“×”)
=5:8= %= ÷32=0.625.
4÷ == :15== %=( 小数)
12: ==0.6=48÷ .
:30=30÷ === (小数)= 折.
75%= (小数)= (成数)= (折数)= : .