计算下列各题:(1)(-5)+(-2)+(+9)-(-8);(2)-15+(+3)-(-15)+(+7)-(+2)+(-8);(3)0.85+(+0.75)-(+234)+(-1.85)+(+3);(

题目简介

计算下列各题:(1)(-5)+(-2)+(+9)-(-8);(2)-15+(+3)-(-15)+(+7)-(+2)+(-8);(3)0.85+(+0.75)-(+234)+(-1.85)+(+3);(

题目详情

计算下列各题:
(1)(-5)+(-2)+(+9)-(-8);
(2)-15+(+3)-(-15)+(+7)-(+2)+(-8);
(3)0.85+(+0.75)-(+2
3
4
)+(-1.85)+(+3)

(4)2-[(-5
2
3
)-(-
1
3
)]

(5)1-(-
1
2
)+(-
1
3
)-
3
4

(6)|5
1
11
-3
4
17
|+4
4
17
-
1
11
题型:解答题难度:中档来源:不详

答案

(1)(-5)+(-2)+(+9)-(-8)
=-5-2+9+8
=-7+17
=10;

(2)-15+(+3)-(-15)+(+7)-(+2)+(-8)
=-15+3+15+7-2-8
=-15+15+3+7-2-8
=0+10-10
=0;

(3)0.85+(+0.75)-(+2class="stub"3
4
)+(-1.85)+(+3)

=0.85+0.75-2class="stub"3
4
-1.85+3
=0.85+0.75-2.75-1.85+3
=0.85-1.85+0.75-2.75+3
=-1-2+3
=0;

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

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

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

=7class="stub"2
3
-class="stub"1
3

=7class="stub"1
3


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

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

=1+class="stub"6
12
-class="stub"4
12
-class="stub"9
12

=1-class="stub"7
12

=class="stub"5
12


(6)|5class="stub"1
11
-3class="stub"4
17
|+4class="stub"4
17
-class="stub"1
11

=5class="stub"1
11
-3class="stub"4
17
+4class="stub"4
17
-class="stub"1
11

=5class="stub"1
11
-class="stub"1
11
+4class="stub"4
17
-3class="stub"4
17

=5+1
=6.

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