口算.65+13=________, 53+4=________;68+10=________, 34+64=_______;51+17=________.
÷12=35: =125%= ÷0.4= (小数)
9÷4== : =2= %= .
24÷ =0.6=12: = %
15: = %== 折= .(填小数)
= ÷25=2:5= %.