题目内容
计算:
|
| 3 | 8 |
| 132-122 |
分析:先开方,再加减,注意:
=
=
=5.
| 132-122 |
| (13+12)(13-12) |
| 25 |
解答:解:原式=
-2+
,
=
-2+5,
=
.
| 4 |
| 5 |
| (13+12)(13-12) |
=
| 4 |
| 5 |
=
| 19 |
| 5 |
点评:本题考查实数的运算能力,同时利用了平方差公式.
练习册系列答案
相关题目
题目内容
计算:
|
| 3 | 8 |
| 132-122 |
| 132-122 |
| (13+12)(13-12) |
| 25 |
| 4 |
| 5 |
| (13+12)(13-12) |
| 4 |
| 5 |
| 19 |
| 5 |