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

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

题型:解答题难度:一般来源:不详
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
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)-(+2
3
4
)+(-1.85)+(+3)

=0.85+0.75-2
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-[(-5
2
3
)-(-
1
3
)]

=2-(-5
2
3
+
1
3

=2+5
2
3
-
1
3

=7
2
3
-
1
3

=7
1
3


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

=1+
1
2
-
1
3
-
3
4

=1+
6
12
-
4
12
-
9
12

=1-
7
12

=
5
12


(6)|5
1
11
-3
4
17
|+4
4
17
-
1
11

=5
1
11
-3
4
17
+4
4
17
-
1
11

=5
1
11
-
1
11
+4
4
17
-3
4
17

=5+1
=6.
举一反三
0-16+(-29)-(-7)-(+11).
题型:解答题难度:一般| 查看答案
计算:
(1)(-23)+(-12);
(2)6-(+3)-(-7)+(-2);
(3)-16
1
3
+29
1
6

(4)-0.5-(-3
1
4
)+2.75-7
1
2

(5)-(-7)+(-2);
(6)(-4
1
4
)-(+5
1
3
)-(-4
1
4
);
(7)(+9)+(-7)+(+10)+(-3)+(-9);
(8)1-3+5-7+9-11+…+97-99+100.
题型:解答题难度:一般| 查看答案
-20+(-14)-(-18)-13
题型:解答题难度:一般| 查看答案
计算:
(1)(-10)+15;
(2)(-0.9)+(-3.6);
(3)0+(-4.5);
(4)15-(-7);
(5)(-2.7)-(+2.3);
(6)
1
3
-
1
4

(7)18+(-12)+(-21)+(+12);
(8)0.35+(-0.6)+0.25+(-5.4);
(9)-26+43-24+13-46;
(10)(-3
3
7
)+12.5+(-16
4
7
)+(-2.5)
题型:解答题难度:一般| 查看答案
把(+3)-(-6)-(+7)+(-8)写成省略加号的和的形式为______.
题型:填空题难度:一般| 查看答案
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