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(1)计算:3tan30°+|3?π|?3(2010?π)0+(?1)2013.(2)先化简,再求值:(3xx+1?xx?1)÷x?2x2?1,其中x
(1)计算:3tan30°+|3?π|?3(2010?π)0+(?1)2013.(2)先化简,再求值:(3xx+1?xx?1)÷x?2x2?1,其中x=32....
(1)计算:3tan30°+|3?π|?3(2010?π)0+(?1)2013.(2)先化简,再求值:(3xx+1?xx?1)÷x?2x2?1,其中x=32.
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(1)原式=3×
+π-3-
-1
=
+π-3-
-1
=π-4;
(2)原式=
×
=
=2x.
| ||
3 |
3 |
=
3 |
3 |
=π-4;
(2)原式=
3x(x?1)?x(x+1) |
(x+1)(x?1) |
(x+1)(x?1) |
x?2 |
=
2x(x?2) |
x?2 |
=2x.
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