题目内容
(1)解方程:x2-2x-3=0;
(2)计算:(2
-3
)×
.
(2)计算:(2
| 12 |
|
| 6 |
(1)x2-2x-3=0
(x-3)(x+1)=0
x=3或-1;
(2)原式=(2×2
-3×
)×
=(4
-
)×
=3
×
=9
.
(x-3)(x+1)=0
x=3或-1;
(2)原式=(2×2
| 3 |
| ||
| 3 |
| 6 |
=(4
| 3 |
| 3 |
| 6 |
=3
| 3 |
| 6 |
=9
| 2 |
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