题目内容
解方程.
1-
x=
50%x-
=
x+125%x=80%
1-
| 4 |
| 7 |
| 1 |
| 21 |
50%x-
| 1 |
| 4 |
| 1 |
| 2 |
| 3 |
| 4 |
(1)1-
x=
,
1-
x+
x=
+
x,
+
x=1,
+
x-
=1-
,
x=
,
x=
;
(2)50%x-
=
,
50%x-
+
=
+
,
0.5x=
,
x=
;
(3)
x+125%x=80%,
2x=0.8,
x=0.4.
| 4 |
| 7 |
| 1 |
| 21 |
1-
| 4 |
| 7 |
| 4 |
| 7 |
| 1 |
| 21 |
| 4 |
| 7 |
| 1 |
| 21 |
| 4 |
| 7 |
| 1 |
| 21 |
| 4 |
| 7 |
| 1 |
| 21 |
| 1 |
| 21 |
| 4 |
| 7 |
| 20 |
| 21 |
x=
| 5 |
| 3 |
(2)50%x-
| 1 |
| 4 |
| 1 |
| 2 |
50%x-
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
0.5x=
| 3 |
| 4 |
x=
| 3 |
| 2 |
(3)
| 3 |
| 4 |
2x=0.8,
x=0.4.
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