题目内容
解方程
(1)10.4-x=9
;
(2)x-
=
;
(3)x+
=
+
.
(1)10.4-x=9
| 2 |
| 5 |
(2)x-
| 3 |
| 7 |
| 2 |
| 3 |
(3)x+
| 14 |
| 15 |
| 1 |
| 6 |
| 4 |
| 5 |
(1)10.4-x=9
,
10.4-x+x=9.4+x,
9.4+x=10.4,
9.4-9.4+x=10.4-9.4,
x=1;
(2)x-
=
,
x-
+
=
+
,
x=
+
,
x=
;
(3)x+
=
+
,
x+
=
,
x+
-
=
-
,
x=
-
,
x=
.
| 2 |
| 5 |
10.4-x+x=9.4+x,
9.4+x=10.4,
9.4-9.4+x=10.4-9.4,
x=1;
(2)x-
| 3 |
| 7 |
| 2 |
| 3 |
x-
| 3 |
| 7 |
| 3 |
| 7 |
| 2 |
| 3 |
| 3 |
| 7 |
x=
| 14 |
| 21 |
| 9 |
| 21 |
x=
| 23 |
| 21 |
(3)x+
| 14 |
| 15 |
| 1 |
| 6 |
| 4 |
| 5 |
x+
| 14 |
| 15 |
| 29 |
| 30 |
x+
| 14 |
| 15 |
| 14 |
| 15 |
| 29 |
| 30 |
| 14 |
| 15 |
x=
| 29 |
| 30 |
| 28 |
| 30 |
x=
| 1 |
| 30 |
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