题目内容
解方程或比例:
x:
|
| 3:x=9:15 |
|
|
(1)x:
| 3 |
| 8 |
| 2 |
| 3 |
4x=
| 3 |
| 8 |
| 2 |
| 3 |
4x=
| 1 |
| 4 |
4x÷4=
| 1 |
| 4 |
x=
| 1 |
| 16 |
(2)
| x |
| 9 |
| 0.8 |
| 4.5 |
4.5x=9×0.8,
4.5x=7.2,
4.5x÷4.5=7.2÷4.5,
x=1.6;
(3)3:x=9:15,
9x=3×15,
9x=45,
9x÷9=45÷9,
x=5;
(4)
| x |
| 25 |
| 1.2 |
| 75 |
75x=25×1.2,
75x=30,
75x÷75=30÷75,
x=0.4;
(5)
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3 |
| 1 |
| 20 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 20 |
| 1 |
| 3 |
x=
| 3 |
| 20 |
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