计算.(1)29+156-(-79)-(+216);(2)(-32)+(-512)+52+(-712);(3)1214-(+1.75)-(-512)+(-7.25)-(-234)-2.5.-数学

题目简介

计算.(1)29+156-(-79)-(+216);(2)(-32)+(-512)+52+(-712);(3)1214-(+1.75)-(-512)+(-7.25)-(-234)-2.5.-数学

题目详情

计算.
(1)
2
9
+1
5
6
-(-
7
9
)-(+2
1
6
)
;      
(2)(-
3
2
)+(-
5
12
)+
5
2
+(-
7
12
)

(3)12
1
4
-(+1.75)-(-5
1
2
)+(-7.25)-(-2
3
4
)-2.5
题型:解答题难度:中档来源:不详

答案

(1)原式=class="stub"2
9
+1class="stub"5
6
+class="stub"7
9
-2class="stub"1
6

=1-class="stub"1
3

=class="stub"2
3


(2)原式=-class="stub"3
2
-class="stub"5
12
+class="stub"5
2
-class="stub"7
12

=1-1
=0;

(3)原式=12.25-1.75+5.5-7.25+2.75-2.5
=9.

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