题目内容
化简下列各比:
3.5:
:
20:60:150.
3.5:
| 5 |
| 7 |
| 1 |
| 20 |
| 1 |
| 5 |
20:60:150.
(1)3.5:
,
=(3.5×7):(
×7),
=24.5:5,
=(24.5×10):(5×10),
=245:50,
=(245÷5):(50÷5),
=49:10;
(2)
:
,
=(
×20):(
×20),
=1:4;
(3)20:60:150,
=(20÷10):(60÷10):(150÷10),
=2:6:15.
| 5 |
| 7 |
=(3.5×7):(
| 5 |
| 7 |
=24.5:5,
=(24.5×10):(5×10),
=245:50,
=(245÷5):(50÷5),
=49:10;
(2)
| 1 |
| 20 |
| 1 |
| 5 |
=(
| 1 |
| 20 |
| 1 |
| 5 |
=1:4;
(3)20:60:150,
=(20÷10):(60÷10):(150÷10),
=2:6:15.
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