题目内容
计算题:
(1)(
)2-
+
+
(2)|
-
|-|2-
|-|
-1|
(3)(x+1)(x-5)+4(x-1)
(4)(a+b-c)(a-b+c)
(1)(
| 3 |
| 16 |
| 3 | -8 |
| (-2)2 |
(2)|
| 2 |
| 3 |
| 3 |
| 3 |
(3)(x+1)(x-5)+4(x-1)
(4)(a+b-c)(a-b+c)
(1)原式=3-4-2+2
=-1;
(2)原式=
-
-(2-
)-(
-1)
=
-
-2+
-
+1
=
-
-1;
(3)原式=x2-5x+x-5+4x-4
=x2-9;
(4)原式=[a+(b-c)][a-(b-c)]
=a2-(b-c)2
=a2-(b2-2bc+c2)
=a2-b2+2bc-c2.
=-1;
(2)原式=
| 3 |
| 2 |
| 3 |
| 3 |
=
| 3 |
| 2 |
| 3 |
| 3 |
=
| 3 |
| 2 |
-1;
(3)原式=x2-5x+x-5+4x-4
=x2-9;
(4)原式=[a+(b-c)][a-(b-c)]
=a2-(b-c)2
=a2-(b2-2bc+c2)
=a2-b2+2bc-c2.
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