计算 (1)18-(41/2-50); (2)(7+43)(7-43)-(35-1)2.
问题描述:
计算
(1)
-(4
18
-
1 2
);
50
(2)(7+4
)(7-4
3
)-(3
3
-1)2.
5
答
(1)原式=3
-2
2
+5
2
2
=6
;
2
(2)原式=49-48-(45-6
+1)
5
=1-46+6
5
=-45+6
.
5