题目内容

化简比和求比值.
4:16
5.6:4.275:15
3
7
9
21
12.5%:0.5
3
2
:37.5%
(1)4:16,
=(4÷4):(16÷4),
=1:4;
4:16=1:4=1÷4=
1
4


(2)5.6:4.2,
=(5.6×10÷14):(4.2×10÷14),
=4:3;
5.6:4.2=4:3=4÷3=
4
3


(3)75:15,
=(75÷15):(15÷15),
=5:1;
75:15=5:1=5÷1=5.

(4)
3
7
9
21

=(
3
7
×21):(
9
21
×21),
=9:9,
=1:1;
3
7
9
21
=1:1=1÷1=1.

(5)12.5%:0.5,
=(0.125×8):(0.5×8),
=1:4;
12.5%:0.5=1:4=1÷4=
1
4


(6)
3
2
:37.5%,
=(
3
2
×8):(
3
8
×8),
=12:3,
=4:1;
3
2
:37.5%=4:1=4÷1=4.
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