问题
解答题
细致算一算! (1)19+(-24); (2)-3-(-4)+7 (3)14-25-(-12)-17 (4)43-26+13-24-46 (5)-23+18-1-15+2 (6)-
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答案
(1)19+(-24)=-(24-19)=-5;
(2)-3-(-4)+7=-3+4+7=-3+11=8;
(3)14-25-(-12)-17=14-25+12-17=26-42=-12;
(4)43-26+13-24-46=56-96=-40;
(5)-23+18-1-15+2=20-49=-29;
(6)-
-1 2
+5 4
-3 2
=1-1 4
=-3 2
.1 2