(1) =日产量×天数(2)12345÷40的商是 位数.
÷ =0.375== :32= %
2:5= :10=10÷ = (填小数)
0.4= : =10: = :35= %
=20÷ =8: =0.8= %= .
=3÷2=15: = %= (小数)