题目内容
求未知数X．
| 1-
| 1÷（
|
①
X-
X=1
X=1
X×
=
X=2
②1-
X=
1+
X-
X=
+
X
X+
-
=1-
X=
X×
=
×
X=
③1÷（
X-
）=3
1×（
X-
）÷（
X-
）=3×（
X-
）
3×（
X-
）=1
X-
=1
X+
-
=1+
X=
X×
=
×
X=
| 2 |
| 3 |
| 1 |
| 5 |
| 7 |
| 15 |
| 7 |
| 15 |
| 15 |
| 7 |
| 15 |
| 7 |
X=2
| 1 |
| 7 |
②1-
| 4 |
| 5 |
| 1 |
| 3 |
1+
| 4 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
| 4 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 4 |
| 5 |
| 5 |
| 4 |
| 2 |
| 3 |
| 5 |
| 4 |
X=
| 5 |
| 6 |
③1÷（
| 4 |
| 5 |
| 1 |
| 5 |
1×（
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
3×（
| 4 |
| 5 |
| 1 |
| 5 |
| 12 |
| 5 |
| 3 |
| 5 |
| 12 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 12 |
| 5 |
| 8 |
| 5 |
| 12 |
| 5 |
| 5 |
| 12 |
| 8 |
| 5 |
| 5 |
| 12 |
X=
| 2 |
| 3 |
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