题目内容
求未知数x.
(1)
:
=
:x
(2)
-5x=0.75.
(1)
| 1 |
| 3 |
| 1 |
| 20 |
| 5 |
| 9 |
(2)
| 3 |
| 4 |
(1)
:
=
:x,
x=
×
,
x÷
=
÷
,
x=
;
(2)
-5x=0.75,
-5x+5x=0.75+5x,
=0.75+5x,
-0.75=0.75+5x-0.75,
0=5x,
x=0.
| 1 |
| 3 |
| 1 |
| 20 |
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 20 |
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 36 |
| 1 |
| 3 |
x=
| 1 |
| 12 |
(2)
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
0=5x,
x=0.
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