问题:
(1)化简:
75
×
6
3
÷
1
2
;
(2)
4
4-
11
-
4
11
-
7
-
2
3+
7
;
(3)解方程:(x-1)(x+3)=5;
(4)x 2-4x-12=0(用求根公式).
(1)化简:
×
÷
;
(2)
-
-
;
(3)解方程:(x-1)(x+3)=5;
(4)x 2-4x-12=0(用求根公式).
75 |
|
||
3 |
1 | ||
|
(2)
4 | ||
4-
|
4 | ||||
|
2 | ||
3+
|
(3)解方程:(x-1)(x+3)=5;
(4)x 2-4x-12=0(用求根公式).
参考答案: