题目内容
| 化简下列比. 12﹕21 | 0.25﹕1 | 2﹕
| ||||
| 0.3﹕0.4 | 16﹕20. |
12:21,
=(12÷3):(21÷3),
=4:7;
0.25:1,
=(0.25×4):(1×4),
=1:4;
2:
,
=(2×4):(
×4),
=8:1;
:
,
=(
×20):(
×20),
=8:5;
0.3﹕0.4,
=(0.3×10)﹕(0.4×10),
=3:4;
16﹕20,
=(16÷4)﹕(20÷4),
=4:5.
=(12÷3):(21÷3),
=4:7;
0.25:1,
=(0.25×4):(1×4),
=1:4;
2:
| 1 |
| 4 |
=(2×4):(
| 1 |
| 4 |
=8:1;
| 2 |
| 5 |
| 1 |
| 4 |
=(
| 2 |
| 5 |
| 1 |
| 4 |
=8:5;
0.3﹕0.4,
=(0.3×10)﹕(0.4×10),
=3:4;
16﹕20,
=(16÷4)﹕(20÷4),
=4:5.
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