题目内容
计算:
(1)(-1)3+(2012-
)0-(
)-2
(2)
-
(3)
-
(4)
÷
.
(1)(-1)3+(2012-
| 2 |
| 1 |
| 2 |
(2)
| (a+b)2 |
| ab |
| (a-b)2 |
| ab |
(3)
| 3 |
| x-4 |
| 24 |
| x2-16 |
(4)
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
(1)原式=-1+1-4
=-4;
(2)原式=
=
=4;
(3)原式=
-
=
=
=
;
(4)原式=
•
=x.
=-4;
(2)原式=
| a2+2ab+b2-(a2-2ab+b2) |
| ab |
=
| 4ab |
| ab |
=4;
(3)原式=
| 3(x+4) |
| (x+4)(x-4) |
| 24 |
| (x+4)(x-4) |
=
| 3x-12 |
| (x+4)(x-4) |
=
| 3(x-4) |
| (x+4)(x-4) |
=
| 3 |
| x+4 |
(4)原式=
| (x-1)2 |
| (x+1)(x-1) |
| x(x+1) |
| x-1 |
=x.
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