问题
解答题
计算 (1)-3+8+(-7); (2)
(3)(
(4)(-
|
答案
(1)-3+8+(-7)
=-3+8-7
=-10+8
=-2;
(2)
-5 6
+(-2 7
)-1 6 5 7
=(
-5 6
)+(-1 6
-5 7
)2 7
=
-12 3
=-
;1 3
(3)(
-1 2
+5 9
)×(-36)7 12
=-
×36+1 2
×36-5 9
×367 12
=-18+20-21
=-19;
(4)(-
)4=2 3
.16 81