问题
解答题
计算:(1)-31+25+(-69) (2)(-
|
答案
(1)-31+25+(-69)=-31+25-69=-75;
(2)(-
)-(-1 2
)-(+1 3
)=-1 4
+1 2
-1 3
=-1 4
+6 12
-4 12
=-3 12
.5 12
计算:(1)-31+25+(-69) (2)(-
|
(1)-31+25+(-69)=-31+25-69=-75;
(2)(-
)-(-1 2
)-(+1 3
)=-1 4
+1 2
-1 3
=-1 4
+6 12
-4 12
=-3 12
.5 12