题目内容
求未知数x
| x+
|
|
(1)
:x=3:16,
3x=
×16,
3x÷3=12÷3,
x=4;
(2)x+
x-4=16,
x-4+4=16+4,
x÷
=20÷
,
x=18;
(3)
=
,
3x+6=42,
3x+6-6=42-6,
3x÷3=36÷3,
x=12.
| 3 |
| 4 |
3x=
| 3 |
| 4 |
3x÷3=12÷3,
x=4;
(2)x+
| 1 |
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
x=18;
(3)
| 70 |
| x+2 |
| 3 |
| 0.6 |
3x+6=42,
3x+6-6=42-6,
3x÷3=36÷3,
x=12.
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