题目内容
解比例:
500:X=
| X:10%=3:2.4 |
| ||||||||
| 2:
| 13:X=0.03:0.07. |
根据比例的基本性质可解得.
①500:X=
500:X=5:21
5X=500×21
X=
X=2100.
②X:10%=3:2.4
2.4X=3×10%
X=3×10%÷2.4
X=0.125.
③
:
=X:
X=
×
X=
×
×8
X=
.
④
=
54X=36×3
X=
X=2.
⑤2:
=X:35
X=2×35
X=2×35×
X=
.
⑥13:X=0.03:0.07.
0.03X=13×0.07
X=
X=
.
①500:X=
| 5 |
| 21 |
500:X=5:21
5X=500×21
X=
| 500×21 |
| 5 |
X=2100.
②X:10%=3:2.4
2.4X=3×10%
X=3×10%÷2.4
X=0.125.
③
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 10 |
X=
| 1 |
| 4 |
| 1 |
| 10 |
X=
| 1 |
| 5 |
④
| 36 |
| x |
| 54 |
| 3 |
54X=36×3
X=
| 36×3 |
| 54 |
X=2.
⑤2:
| 25 |
| 6 |
| 25 |
| 6 |
X=2×35×
| 6 |
| 25 |
X=
| 84 |
| 5 |
⑥13:X=0.03:0.07.
0.03X=13×0.07
X=
| 13×0.07 |
| 0.03 |
X=
| 91 |
| 3 |
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