题目内容
(1)计算:(
+
)÷
;
(2)解方程:
+
=3.
| a2-4 |
| a2-4a+4 |
| 2-a |
| a+2 |
| a |
| a-2 |
(2)解方程:
| 3 |
| 2x-2 |
| 1 |
| 1-x |
(1)原式=[
+
]÷
=(
+
)÷
=(
÷
=
×
=
;
(2)方程两边都乘2(x-1)得
3-2=3×2(x-1)得
解得x=
.
经检验:x=
是原方程的解.
| (a+2)(a-2) |
| (a-2)2 |
| 2-a |
| a+2 |
| a |
| a-2 |
=(
| a+2 |
| a-2 |
| 2-a |
| a+2 |
| a |
| a-2 |
=(
| (a+2)2-(a-2)2 |
| (a+2)(a-2) |
| a |
| a-2 |
=
| 8a |
| (a+2)(a-2) |
| a-2 |
| a |
=
| 8 |
| a+2 |
(2)方程两边都乘2(x-1)得
3-2=3×2(x-1)得
解得x=
| 7 |
| 6 |
经检验:x=
| 7 |
| 6 |
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