问题 解答题
化简下面各比.
21:35                0.36:0.2                
1
8
1
7
答案

①21:35,

=(21÷7):(35÷7),

=3:5;

②0.36:0.2,

=(0.36×100):(0.2×100),

=36:20,

=(36÷4):(20÷4),

=9:5;

1
8
1
7

=(

1
8
×56):(
1
7
×56),

=7:8.

单项选择题
单项选择题