题目内容
| 求未知数x ①1.5x-0.6×15=18 | ②
| ③
|
(1)1.5x-0.6×15=18,
1.5x-9=18,
1.5x-9+9=18+9,
1.5x÷1.5=27÷1.5,
x=18;
(2)
:x=3:12,
3x=
×12,
3x÷3=9÷3,
x=3;
(3)
x+
x=42,
x=42,
x×
=42×
,
x=36.
1.5x-9=18,
1.5x-9+9=18+9,
1.5x÷1.5=27÷1.5,
x=18;
(2)
| 3 |
| 4 |
3x=
| 3 |
| 4 |
3x÷3=9÷3,
x=3;
(3)
| 1 |
| 2 |
| 2 |
| 3 |
| 7 |
| 6 |
| 7 |
| 6 |
| 6 |
| 7 |
| 6 |
| 7 |
x=36.
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