3∶5=( )÷( )=
(分数先填分子，后填分母)
把下面除式改写成比的形式.
0.7 ( ) ∶( )
1÷1.5 ( )∶( )
4.5÷3.6 ( )∶( )
12÷9 ( )∶( )
17÷20 ( )∶( )
11÷3 ( )∶( )
写出下面各数的倒数．
(1)
(2)
0.7 (
) ∶(
) 
