题目内容
解方程.
x+
x=
;
x-
x=25;
1-
x=
.
| 3 |
| 7 |
| 1 |
| 4 |
| 19 |
| 5 |
x-
| 5 |
| 6 |
1-
| 1 |
| 6 |
| 1 |
| 2 |
(1)
x+
x=
(
+
)X=
X=
X×
=
×
X=
;
(2)x-
x=25
(1-
)X=25
X=25
X×6=25×6
X=150;
(3)1-
X=
1-
X+
X=
+
X
+
X=1
+
X-
=1-
X=
X×6=
×6
X=3.
| 3 |
| 7 |
| 1 |
| 4 |
| 19 |
| 5 |
(
| 3 |
| 7 |
| 1 |
| 4 |
| 19 |
| 5 |
| 19 |
| 28 |
| 19 |
| 5 |
| 19 |
| 28 |
| 28 |
| 19 |
| 19 |
| 5 |
| 28 |
| 19 |
X=
| 28 |
| 5 |
(2)x-
| 5 |
| 6 |
(1-
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 6 |
X=150;
(3)1-
| 1 |
| 6 |
| 1 |
| 2 |
1-
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
X=3.
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