题目内容
计算题:
(1)
-
;
(2)
+
;
(3)|-3|+(-1)2013×(π-3)-(-
)-3.
(1)
| 5x+3y |
| x2-y2 |
| 2x |
| x2-y2 |
(2)
| 1 |
| x+1 |
| 2 |
| x2-1 |
(3)|-3|+(-1)2013×(π-3)-(-
| 1 |
| 2 |
(1)原式=
=
=
;
(2)原式=
+
=
=
;
(3)原式=3-1×(π-3)+8
=3-π+3+8
=14-π.
| 5x+3y-2x |
| x2-y2 |
=
| 3(x+y) |
| (x+y)(x-y) |
=
| 3 |
| x-y |
(2)原式=
| x-1 |
| (x+1)(x-1) |
| 2 |
| (x+1)(x-1) |
=
| x+1 |
| (x+1)(x-1) |
=
| 1 |
| x-1 |
(3)原式=3-1×(π-3)+8
=3-π+3+8
=14-π.
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