题目内容
求未知数x的值.
| (1)1.5x+3x=9 | (2)2x÷
|
(1)1.5x+3x=9,
4.5x=9,
4.5x÷4.5=9÷4.5,
x=2;
(2)2x÷
=
,
2x÷
×
=
×
,
2x=
,
2x÷2=
÷2,
x=
.
4.5x=9,
4.5x÷4.5=9÷4.5,
x=2;
(2)2x÷
| 3 |
| 4 |
| 8 |
| 15 |
2x÷
| 3 |
| 4 |
| 3 |
| 4 |
| 8 |
| 15 |
| 3 |
| 4 |
2x=
| 2 |
| 5 |
2x÷2=
| 2 |
| 5 |
x=
| 1 |
| 5 |
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