一1 四分之三=( )除以( )=( ):( )=( )%
2 1.2小时:48分钟=( ):( )
3 一个城市的面积是15平方公里,其中绿地面积为2500000平方米,这个城市的绿地面积与城市面积之比是___?
4 正方形的边长与周长之比是___?
5 Find the ratio(比)of the following:
(1)Number of the black cats:number of the white cats=___:___;
(2)Father's height:son's height=___:___.
二求比值
1 一有四分之三:2.2
2 15分米:1.1米
三求出下列各式的X
1 X:一有五分之一=12
2 1.8:X=二有三分之二
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