题目内容
(1)计算:
+15×(-
)-(-2)2.
(2)化简:(
-
)•
.
| 16 |
| 1 |
| 3 |
(2)化简:(
| x2 |
| x+1 |
| 1 |
| x+1 |
| x2 |
| x2-x |
(1)
+15×(-
)-(-2)2
=4+(-5)-4…(3分)
=-5;…(5分)
(2)(
-
)•
=
•
…(1分)
=
•
…(3分)
=x.…(5分)
| 16 |
| 1 |
| 3 |
=4+(-5)-4…(3分)
=-5;…(5分)
(2)(
| x2 |
| x+1 |
| 1 |
| x+1 |
| x2 |
| x2-x |
=
| x2-1 |
| x+1 |
| x2 |
| x2-x |
=
| (x+1)(x-1) |
| x+1 |
| x2 |
| x(x-1) |
=x.…(5分)
练习册系列答案
相关题目