题目内容
先简化,再求比值.
| 化简:1.5:2.1 | 14:35 |
| 6千米:300米 | ||||
| 求比值:1.5:2.1 | 14:35 |
| 6千米:300米. |
(1)1.5:2.1,
=(1.5×10):(2.1×10),
=15:21,
=5:7;
1.5:2.1,
=5:7,
=5÷7,
=
;
(2)14:35,
=(14÷7):(35÷7),
=2:5;
14:35,
=2:5,
=2÷5,
=
;
(3)
:
,
=(
×24):(
×24),
=15:20,
=3:4;
:
,
=3:4,
=3÷4,
=
;
(4)6千米:300米,
=6000米:300米,
=20:1;
6千米:300米,
=20:1,
=20÷1,
=20.
=(1.5×10):(2.1×10),
=15:21,
=5:7;
1.5:2.1,
=5:7,
=5÷7,
=
| 5 |
| 7 |
(2)14:35,
=(14÷7):(35÷7),
=2:5;
14:35,
=2:5,
=2÷5,
=
| 2 |
| 5 |
(3)
| 5 |
| 8 |
| 5 |
| 6 |
=(
| 5 |
| 8 |
| 5 |
| 6 |
=15:20,
=3:4;
| 5 |
| 8 |
| 5 |
| 6 |
=3:4,
=3÷4,
=
| 3 |
| 4 |
(4)6千米:300米,
=6000米:300米,
=20:1;
6千米:300米,
=20:1,
=20÷1,
=20.
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