题目内容
求未知数X:
(1)
X+
X=1
(2)
-2X=
.
(1)
| 2 |
| 3 |
| 2 |
| 5 |
(2)
| 3 |
| 4 |
| 5 |
| 8 |
(1)
X+
X=1,
X+
X=1,
X=1,
X÷
=1÷
,
X=1×
,
x=
;
(2)
-2X=
,
-2X+2X=
+2X,
+2X=
,
-
+2X=
-
,
2X=
-
,
2X=
,
2X÷2=
÷2,
X=
×
,
X=
.
| 2 |
| 3 |
| 2 |
| 5 |
| 10 |
| 15 |
| 6 |
| 15 |
| 16 |
| 15 |
| 16 |
| 15 |
| 16 |
| 15 |
| 16 |
| 15 |
X=1×
| 15 |
| 16 |
x=
| 15 |
| 16 |
(2)
| 3 |
| 4 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
2X=
| 6 |
| 8 |
| 5 |
| 8 |
2X=
| 1 |
| 8 |
2X÷2=
| 1 |
| 8 |
X=
| 1 |
| 8 |
| 1 |
| 2 |
X=
| 1 |
| 16 |
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