(1)(-5)-(+3)+(-9)-(-7);(2)12+(-25)+(-34)+25.-数学

题目简介

(1)(-5)-(+3)+(-9)-(-7);(2)12+(-25)+(-34)+25.-数学

题目详情

(1)(-5)-(+3)+(-9)-(-7);
(2)
1
2
+(-
2
5
)+(-
3
4
)+
2
5
题型:解答题难度:中档来源:不详

答案

(1)(-5)-(+3)+(-9)-(-7)
=-5-3-9+7
=-10;
(2)class="stub"1
2
+(-class="stub"2
5
)+(-class="stub"3
4
)+class="stub"2
5

=class="stub"1
2
-class="stub"2
5
-class="stub"3
4
+class="stub"2
5

=(class="stub"1
2
-class="stub"3
4
)+(-class="stub"2
5
+class="stub"2
5

=-0.25.

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