题目内容
| 解方程. χ+
| χ-
| 8χ-9.1=22.9. |
(1)x+
=
,
x+
-
=
-
,
x=
,
(2)x-
=
+
,
x-
=
,
x-
+
=
+
,
x=
;
(3)8x-9.1=22.9,
8x-9.1+9.1=22.9+9.1,
8x÷8=32÷8,
x=4.
| 3 |
| 7 |
| 3 |
| 4 |
x+
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
x=
| 9 |
| 28 |
(2)x-
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
x-
| 2 |
| 3 |
| 3 |
| 4 |
x-
| 2 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
x=
| 17 |
| 12 |
(3)8x-9.1=22.9,
8x-9.1+9.1=22.9+9.1,
8x÷8=32÷8,
x=4.
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