计算(1)(-12)-5+(-14)-(-39)(2)(+14)+(?213)?(?234)(?(+323)(3)(?12?13+34)×(?12)(4)-120

2025-02-26 01:29:21
推荐回答(1个)
回答1:

(1)原式=-12-5-14+39=-31+39=8;
(2)原式=
1
4
+2
3
4
-2
1
3
-3
2
3
=3-6=-3;
(3)原式=6+4-9=1;
(4)原式=-1-
1
2
×
1
3
×(3-9)=-1+1=0.