问题 解答题
计算:
(1)(
7
)2

(2)(-2
7
)2

(3)(
5
2
)2

(4)
10-2

(5)
(-17)2
-(
13
)2

(6)
132-52
答案

(1)(

7
)2=7;

(2)(-2

7
)2=28;

(3)(

5
2
)2=
5
4

(4)

10-2
=
1
100
=
1
10

(5)

(-17)2
-(
13
)2=17-13=4;

(6)

132-52
=
169-25
=
144
=12.

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