问题 解答题
化简下列各比,并求出比值.
(1)
1
5
:60

(2)3:2.5
(3)6.75吨:50千克
(4)3.5:
7
8
答案

(1)

1
5
:60

=(

1
5
×5):(60×5)

=1:300;

1
5
:60

=

1
5
÷60

=

1
300

(2)3:2.5

=(3×2):(2.5×2)

=6:5;

3:2.5

=3÷2.5

=

6
5

(3)6.75吨:50千克

=(6.75×1000千克):50千克

=6750:50

=(6750÷50):(50÷50)

=135:1;

6.75吨:50千克

=(6.75×1000千克)÷50千克

=6750÷50

=135;

(4)3.5:

7
8

=(3.5×

8
7
):(
7
8
×
8
7

=4:1;

3.5:

7
8

=3.5÷

7
8

=4.

单项选择题
单项选择题