题目内容
(1)
=
(2)4
:5
=x:5(3)1.35:9=3:X.
| x |
| 2.8 |
| 1 |
| 4 |
| 2 |
| 5 |
| 1 |
| 3 |
根据比例的基本性质可解得.
(1)
=
4x=2.8×1
x=
x=0.7
(2)4
:5
=x:5
5
x=4
×5
x=
×5
x=
×5×
x=
(3)1.35:9=3:X
1.35x=9×3
x=
x=20.
(1)
| x |
| 2.8 |
| 1 |
| 4 |
4x=2.8×1
x=
| 2.8×1 |
| 4 |
x=0.7
(2)4
| 2 |
| 5 |
| 1 |
| 3 |
5
| 1 |
| 3 |
| 2 |
| 5 |
| 16 |
| 3 |
| 22 |
| 5 |
x=
| 22 |
| 5 |
| 3 |
| 16 |
x=
| 33 |
| 8 |
(3)1.35:9=3:X
1.35x=9×3
x=
| 9×3 |
| 1.35 |
x=20.
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