问题 解答题
计算:
(1)(
2
)2-
(-4)2
+4×
3
1
8
            
(2)|1-
2
|+
3-
8
27
×
1
4
-
2

(3)(x-2)3=-0.125                      
(4)81x2-25=0.
答案

(1)原式=2-4+4×

1
2

=0;

(2)原式=

2
-1-
2
3
×
1
2
-
2

=-

4
3

(3)由题意得:(x-2)=

3-0.125
=-0.5,

解得:x=1.5.

(4)由题意得:x2=

25
81

解得:x=

5
9

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