题目内容
①计算:(2008-π)0-
•cos45°+2-1;②解方程:x2-2x-3=0.
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(1)原式=1-
•
+
=1-1+
=
;
(2)(x-3)(x+1)=0,
∴x-3=0或x+1=0,
∴x1=3,x2=-1.
| 2 |
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| 2 |
| 1 |
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=1-1+
| 1 |
| 2 |
=
| 1 |
| 2 |
(2)(x-3)(x+1)=0,
∴x-3=0或x+1=0,
∴x1=3,x2=-1.
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