题目内容
计算:
(1)-
+
+
(2)|1-
|+
(3)25x2-36=0
(4)(x+3)3=27.
(1)-
| 36 |
2
|
| 3 | 27 |
(2)|1-
| 2 |
(1-
|
(3)25x2-36=0
(4)(x+3)3=27.
(1)原式=-6+
+3=-3+
=-
;
(2)原式=
-1+
-1=2
-2;
(3)移向得,25x2=36,
系数化为1得,x2=
,
开方得,x=±
;
(4)开立方得,x+3=
,
解得,x=-3+3=0.
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
(2)原式=
| 2 |
| 2 |
| 2 |
(3)移向得,25x2=36,
系数化为1得,x2=
| 36 |
| 25 |
开方得,x=±
| 6 |
| 5 |
(4)开立方得,x+3=
| 3 | 27 |
解得,x=-3+3=0.
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