量出下面各角的度数。∠1=_____、∠2=_____、∠3=_____、∠4=_____、∠5=_____
=0.4==12÷ = %= :25.
= (小数)= (百分数)=12: = 折.
0.75== ÷16=27: = %.
= : =33÷ = %
÷4=25%= : =8÷ = 折.