题目内容

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
(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.
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