(1)计算:|3?2|?(π?2)0+12+(?1)2011(2)解方程:x2-x-1=
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(1)原式=2-
-1+2
-1
=(2-1-1)+(-1+2)
,
=
;
(2)∵x2-x-1=0,
∴x=
=
,
∴x1=
,x2=
3 |
3 |
=(2-1-1)+(-1+2)
3 |
=
3 |
(2)∵x2-x-1=0,
∴x=
1±
| ||
2×1 |
1±
| ||
2 |
∴x1=
1+
| ||
2 |
1?
|