题目内容
| 求未知数x. 17x-12x=3.5 |
| 6×3.5-x=1.4 |
|
(1)17x-12x=3.5,
5x=3.5,
5x÷5=3.5÷5,
x=0.7;
(2)
:x=3:12,
3x=12×
,
3x=9,
3x÷3=9÷3,
x=3
(3)6×3.5-x=1.4,
21-x=1.4,
21-x+x=1.4+x,
1.4+x-1.4=21-1.4,
x=19.6;
(4)
:x=
:
,
x=
×
,
x=
,
x×8=
×8,
x=
.
5x=3.5,
5x÷5=3.5÷5,
x=0.7;
(2)
| 3 |
| 4 |
3x=12×
| 3 |
| 4 |
3x=9,
3x÷3=9÷3,
x=3
(3)6×3.5-x=1.4,
21-x=1.4,
21-x+x=1.4+x,
1.4+x-1.4=21-1.4,
x=19.6;
(4)
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
| 1 |
| 40 |
x=
| 1 |
| 5 |
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