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