题目内容
(1)解方程x2+3x-10=0;
(2)计算:(π-2011)°+(sin60°)-1-|tan30°-
|+
.
(2)计算:(π-2011)°+(sin60°)-1-|tan30°-
3 |
3 | 8 |
(1)分解因式得:(x-2)(x+5)=0,
∴x-2=0,x+5=0,
解得:x1=2 x2=-5;
(2)原式=1+(
)-1-(
-
)+2,
=1+
-
+
+2,
=3.
∴x-2=0,x+5=0,
解得:x1=2 x2=-5;
(2)原式=1+(
| ||
2 |
3 |
| ||
3 |
=1+
2
| ||
3 |
3 |
| ||
3 |
=3.
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