题目内容
解方程、计算:
(1)4x2=25
(2)(x-0.7)3=0.027
(3)
+
-(
)2
(4)
-3
.
(1)4x2=25
(2)(x-0.7)3=0.027
(3)
| (-6)2 |
| 3 | 27 |
| 5 |
(4)
| ||||
|
| 5 |
(1)4x2=25,
x2=
,
解得:x=±
;
(2)(x-0.7)3=0.027,
x-0.7=0.3,
解得:x=1;
(3)
+
-(
)2,
=6+3-5,
=4;
(4)
-3
=
-3
,
=3
-3
,
=0.
x2=
| 25 |
| 4 |
解得:x=±
| 25 |
| 2 |
(2)(x-0.7)3=0.027,
x-0.7=0.3,
解得:x=1;
(3)
| (-6)2 |
| 3 | 27 |
| 5 |
=6+3-5,
=4;
(4)
| ||||
|
| 5 |
=
3
| ||||
| 3 |
| 5 |
=3
| 5 |
| 5 |
=0.
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