计算 (1)(2+3)(2-5); (2)2(1+23)+(-2)2-(1-3)0-24.

问题描述:

计算
(1)(

2
+3)(
2
-5);
(2)
2
(1+2
3
)+(-2)2-(1-
3
0-
24

(1)原式=2-5

2
+3
2
-15
=-13-2
2

(2)原式=
2
+2
6
+4-1-2
6

=
2
+3.