题目内容
计算:
(1)(
)2-
+4×
(2)|1-
|+
×
-
(3)(x-2)3=-0.125
(4)81x2-25=0.
(1)(
| 2 |
| (-4)2 |
| 3 |
| ||
(2)|1-
| 2 |
| 3 | -
| ||
|
| 2 |
(3)(x-2)3=-0.125
(4)81x2-25=0.
(1)原式=2-4+4×
=0;
(2)原式=
-1-
×
-
=-
;
(3)由题意得:(x-2)=
=-0.5,
解得:x=1.5.
(4)由题意得:x2=
,
解得:x=
.
| 1 |
| 2 |
=0;
(2)原式=
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
=-
| 4 |
| 3 |
(3)由题意得:(x-2)=
| 3 | -0.125 |
解得:x=1.5.
(4)由题意得:x2=
| 25 |
| 81 |
解得:x=
| 5 |
| 9 |
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