题目内容
计算下列各题
(1)
+
+3
-
(2)|-2
|-(
)0+
(3)3
+
-4
(4)
x2=26-1.
(1)
16 |
3 | 27 |
3 |
(-3)2 |
(2)|-2
2 |
1 |
5 |
2 | ||
|
(3)3
18 |
1 |
5 |
50 |
|
(4)
4 |
9 |
(1)原式=4+3+3
-3
=4+3
;
(2)原式=2
-1+
=3
-1;
(3)原式=9
+
-2
=8
;
(4)方程变形得:x2=
,
解得:x=±
.
3 |
=4+3
3 |
(2)原式=2
2 |
2 |
=3
2 |
(3)原式=9
2 |
2 |
2 |
=8
2 |
(4)方程变形得:x2=
225 |
4 |
解得:x=±
15 |
2 |
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