计算:(1)(-2.8)-(+1.2);(2)(-6)+(+5);(3)-(-2)-|-3|;(4)(-14)-(-0.25);(5)(-0.6)+1.7+(+0.6)+(-1.7)+(-9);(6)

题目简介

计算:(1)(-2.8)-(+1.2);(2)(-6)+(+5);(3)-(-2)-|-3|;(4)(-14)-(-0.25);(5)(-0.6)+1.7+(+0.6)+(-1.7)+(-9);(6)

题目详情

计算:
(1)(-2.8)-(+1.2);
(2)(-6)+(+5);
(3)-(-2)-|-3|;
(4)(-
1
4
)-(-0.25);
(5)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 );
(6)|-2
1
2
|-(-2.5)+1-|1-2
1
2
|

(7)3
1
2
-(-2
1
4
)+(-
1
3
)-
1
4
-(+
1
6
)
题型:解答题难度:中档来源:不详

答案

(1)(-2.8)-(+1.2),
=-2.8-1.2,
=-4;

(2)(-6)+(+5),
=-6+5,
=-1;

(3)-(-2)-|-3|,
=2-3,
=-1;

(4)(-class="stub"1
4
)-(-0.25),
=-class="stub"1
4
+0.25,
=0;

(5)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 );
=(-0.6)+(+0.6)+1.7+(-1.7)+(-9),
=-9;

(6)|-2class="stub"1
2
|-(-2.5)+1-|1-2class="stub"1
2
|,
=2class="stub"1
2
+2.5+1-1class="stub"1
2

=6-1class="stub"1
2

=4class="stub"1
2


(7)3class="stub"1
2
-(-2class="stub"1
4
)+(-class="stub"1
3
)-class="stub"1
4
-(+class="stub"1
6
),
=3class="stub"1
2
+2class="stub"1
4
-class="stub"1
3
-class="stub"1
4
-class="stub"1
6

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

=1.

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