题目内容
| 先化简下面各比,再求比值. 2.1:14 | 0.25:
|
|
|
(1)2.1:14
=(2.1×10):(14×10)
=21:140
=(21÷7):(140÷7)
=3:20;
3:20=3÷20=
;
(2)0.25:
=
:
=(
×28):(
×28)
=7:64;
7:64=7÷64=
;
(3)
:
=(
×6):(
×6)
=4:5;
4:5=4÷5=
;
(4)
:
=(
×
):(
×
)
=3:4;
3:4=3÷4=
.
=(2.1×10):(14×10)
=21:140
=(21÷7):(140÷7)
=3:20;
3:20=3÷20=
| 3 |
| 20 |
(2)0.25:
| 16 |
| 7 |
=
| 1 |
| 4 |
| 16 |
| 7 |
=(
| 1 |
| 4 |
| 16 |
| 7 |
=7:64;
7:64=7÷64=
| 7 |
| 64 |
(3)
| 2 |
| 3 |
| 5 |
| 6 |
=(
| 2 |
| 3 |
| 5 |
| 6 |
=4:5;
4:5=4÷5=
| 4 |
| 5 |
(4)
| 9 |
| 8 |
| 3 |
| 2 |
=(
| 9 |
| 8 |
| 8 |
| 3 |
| 3 |
| 2 |
| 8 |
| 3 |
=3:4;
3:4=3÷4=
| 3 |
| 4 |
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