题目内容
化简:
(1)x-
;
(2)7-
;
(3)
x+
;
(4)
-
x.
(1)x-
| x-1 |
| 3 |
(2)7-
| x+3 |
| 5 |
(3)
| 2 |
| 5 |
| x-1 |
| 2 |
(4)
| 3(x-1) |
| 2 |
| 8 |
| 5 |
考点:整式的加减
专题:
分析:先通分,再合并同类项计算加减法计算即可.
解答:解:(1)x-
=
-
=
=
;
(2)7-
=
-
=
=
;
(3)
x+
=
+
=
=
;
(4)
-
x=
-
=
=
.
| x-1 |
| 3 |
| 3x |
| 3 |
| x-1 |
| 3 |
| 3x-x+1 |
| 3 |
| 2x-1 |
| 3 |
(2)7-
| x+3 |
| 5 |
| 35 |
| 5 |
| x+3 |
| 5 |
| 35-x-3 |
| 5 |
| 32-x |
| 5 |
(3)
| 2 |
| 5 |
| x-1 |
| 2 |
| 4x |
| 10 |
| 5(x-1) |
| 10 |
| 4x+5x-5 |
| 10 |
| 9x-5 |
| 10 |
(4)
| 3(x-1) |
| 2 |
| 8 |
| 5 |
| 15(x-1) |
| 10 |
| 16x |
| 10 |
| 15x-15-16x |
| 10 |
| -x-15 |
| 10 |
点评:考查了整式的加减,几个整式相加减,通常用括号把每一个整式括起来,再用加减号连接;然后去括号、合并同类项.
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