填空:已知∠1=40° 已知∠1=60°∠2= ∠2= ,∠3= ,∠4= .
=0.7=7÷ = %= 折.
= %= : =3.5= ÷ .
= %= : = ÷20= (小数)
:15=== ÷40= %= (填小数)
:===0.25.