化简: (1)27−123; (2)(2+3)2(5-26).

问题描述:

化简:
(1)

27
12
3

(2)(
2
+
3
2(5-2
6
).

(1)原式=

9
-
4

=3-2
=1;
(2)原式=(5+2
6
)(5-2
6

=25-24
=1.