题目内容
计算
(1)
-
(2)
÷
•
(3)先将代数式:(
+
)÷
化简,然后请你选取一个你喜欢且又合理的x的值,再求原式的值.
(1)
| a+9b |
| 3ab |
| a+3b |
| 3ab |
(2)
| x2-1 |
| (x-1)2 |
| 1 |
| x-1 |
| 1 |
| x+1 |
(3)先将代数式:(
| x+2 |
| x-2 |
| 4 |
| x2-4x+4 |
| x |
| x-2 |
(1)
-
=
=
;
(2)
÷
•
=
•
=1;
(3)(
+
)÷
=
×
=
当x=4时,原式=2.
故答案为
、1、2.
| a+9b |
| 3ab |
| a+3b |
| 3ab |
| 6b |
| 3ab |
| 2 |
| a |
(2)
| x2-1 |
| (x-1)2 |
| 1 |
| x-1 |
| 1 |
| x+1 |
=
| x2-1 |
| x-1 |
| 1 |
| x+1 |
=1;
(3)(
| x+2 |
| x-2 |
| 4 |
| x2-4x+4 |
| x |
| x-2 |
=
| x2 |
| (x-2)2 |
| x-2 |
| x |
=
| x |
| x-2 |
当x=4时,原式=2.
故答案为
| 2 |
| a |
练习册系列答案
相关题目