题目内容
求下列各式中的x值:
(1)121x2=64
(2)3x3-24=0
(3)(5-x)2=(-7)2
(4)-25(2x-1)2=(-4)3.
(1)121x2=64
(2)3x3-24=0
(3)(5-x)2=(-7)2
(4)-25(2x-1)2=(-4)3.
(1)121x2=64
x2=
,
x=±
;
(2)3x3-24=0,
3x3=24,
x3=8,
x=2;
(3)(5-x)2=(-7)2,
(5-x)2=49,
5-x=±7,
x1=12,x2=-2;
(4)-25(2x-1)2=(-4)3,
-25(2x-1)2=-64,
(2x-1)2=
,
2x-1=±
,
x1=
,x2=-
.
x2=
| 64 |
| 121 |
x=±
| 8 |
| 11 |
(2)3x3-24=0,
3x3=24,
x3=8,
x=2;
(3)(5-x)2=(-7)2,
(5-x)2=49,
5-x=±7,
x1=12,x2=-2;
(4)-25(2x-1)2=(-4)3,
-25(2x-1)2=-64,
(2x-1)2=
| 64 |
| 25 |
2x-1=±
| 8 |
| 5 |
x1=
| 13 |
| 10 |
| 3 |
| 10 |
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