题目内容
(1)计算:|-1|+50-
•sin45°+2-1;
(2)化简:(2-
)•
.
| 2 |
(2)化简:(2-
| 4 |
| x+3 |
| x |
| x+1 |
(1)原式=1+1-
×
+
=2-1+
=
;
(2)原式=
•
=
•
=
.
| 2 |
| ||
| 2 |
| 1 |
| 2 |
=2-1+
| 1 |
| 2 |
=
| 3 |
| 2 |
(2)原式=
| 2(x+3)-4 |
| x+3 |
| x |
| x+1 |
=
| 2(x+1) |
| x+3 |
| x |
| x+1 |
=
| 2x |
| x+3 |
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