题目内容
解方程.
(1)8-
-
x=
(2)8(x-2)=2(x+7)
(1)8-
| 4 |
| 9 |
| 5 |
| 9 |
| 2 |
| 3 |
(2)8(x-2)=2(x+7)
(1)8-
-
x=
,
7
-
x+
x=
+
x,
7
-
=
+
x-
,
6
÷
=
x÷
,
x=12.4;
(2)8(x-2)=2(x+7),
8x-16=2x-14,
8x-16+16=2x+14+16,
8x-2x=2x-2x+30,
6x÷6=30÷6,
x=5.
| 4 |
| 9 |
| 5 |
| 9 |
| 2 |
| 3 |
7
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 2 |
| 3 |
| 5 |
| 9 |
7
| 5 |
| 9 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 9 |
| 2 |
| 3 |
6
| 8 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
x=12.4;
(2)8(x-2)=2(x+7),
8x-16=2x-14,
8x-16+16=2x+14+16,
8x-2x=2x-2x+30,
6x÷6=30÷6,
x=5.
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