计算 (1)48÷3-21/2×12+24. (2)(3+25)2-(4+7)(4-7)
问题描述:
计算
(1)
÷
48
-2
3
×
1 2
+
12
.
24
(2)(3+2
)2-(4+
5
)(4-
7
)
7
答
(1)原式=
-2
48÷3
+2
×121 2
6
=4-2
+2
6
6
=4;
(2)原式=9+12
+20-(16-7)
5
=29+12
-9
5
=20+12
.
5