化简: (1)27−123; (2)(2+3)2(5-26).
问题描述:
化简:
(1)
;
−
27
12
3
(2)(
+
2
)2(5-2
3
).
6
答
(1)原式=
-
9
4
=3-2
=1;
(2)原式=(5+2
)(5-2
6
)
6
=25-24
=1.