题目内容
求未知数x.
:x=
:
3x+
=
x-25%x=27.
| 12 |
| 25 |
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 3 |
(1)
:x=
:
,
x=
×
,
x×
=
×
×
,
x=
;
(2)3x+
=
,
3x+
-
=
-
,
3x=
,
3x÷3=
÷3,
x=
;
(3)x-25%x=27,
0.75x=27,
0.75x÷0.75=27÷0.75,
x=36.
| 12 |
| 25 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
| 12 |
| 25 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 3 |
| 12 |
| 25 |
| 5 |
| 6 |
| 4 |
| 3 |
x=
| 8 |
| 15 |
(2)3x+
| 1 |
| 2 |
| 5 |
| 3 |
3x+
| 1 |
| 2 |
| 1 |
| 2 |
| 5 |
| 3 |
| 1 |
| 2 |
3x=
| 7 |
| 6 |
3x÷3=
| 7 |
| 6 |
x=
| 7 |
| 18 |
(3)x-25%x=27,
0.75x=27,
0.75x÷0.75=27÷0.75,
x=36.
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