题目内容
计算或化简:
(1)
×sin45°+(
)-1-(
-1)0;
(2)(
-
)(x2-1).
(1)
| 8 |
| 1 |
| 2 |
| 2 |
(2)(
| 1 |
| x-1 |
| 1 |
| x+1 |
(1)原式=2
×
+2-1
=2+2-1
=3;
(2)原式=(
-
)(x+1)(x-1)
=(x+1)-(x-1)
=2.
| 2 |
| ||
| 2 |
=2+2-1
=3;
(2)原式=(
| 1 |
| x-1 |
| 1 |
| x+1 |
=(x+1)-(x-1)
=2.
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