题目内容
(1)|1-
|+|
-
|+|
-2|;
(2)已知a=2-
,b=2+
,求
÷
的值.
| 2 |
| 2 |
| 3 |
| 3 |
(2)已知a=2-
| 2 |
| 2 |
| ab3+a2b2 |
| a2+2ab+b2 |
| a2-ab |
| a2-b2 |
(1)原式=
-1+
-
+2-
=1.
(2)原式=
×
=b2,
当a=2-
,b=2+
,原式=(2+
)2=4+4
+2=6+4
.
| 2 |
| 3 |
| 2 |
| 3 |
=1.
(2)原式=
| ab2(b+a) |
| (a+b)2 |
| (a+b)(a-b) |
| a(a-b) |
=b2,
当a=2-
| 2 |
| 2 |
| 2 |
| 2 |
| 2 |
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