问题 解答题
计算
(1)
12
×
6
24

(2)(2+
3
)(2-
3
)

(3)(
5
-
2
5
)2

(4)
1452-242

(5)
(-64)×(-81)
答案

(1)原式=

2
3
×sqrt6
2
6
=
3

(2)原式=22-3=1;

(3)原式=(

5
2+(
2
5
2-2×
5
×
2
5

=5+

4
5
-4

=

9
5

(4)原式=

(145-24)(145+24)

=

121×169

=11×13

=143;

(5)原式=

64×81

=

64
×
81

=8×9

=72.

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