计算下列各题:(1)(-5)+(-2)+(+9)-(-8);(2)-15+(+3)-(-15)+(+7)-(+2)+(-8);(3
计算下列各题:(1)(-5)+(-2)+(+9)-(-8);(2)-15+(+3)-(-15)+(+7)-(+2)+(-8);(3)0.85+(+0.75)?(+234)...
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);(4)2?[(?523)?(?13)];(5)1?(?12)+(?13)?34;(6)|5111?3417|+4417?111.
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(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
)+(?1.85)+(+3)
=0.85+0.75-2
-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-(-5
+
)
=2+5
-
=7
-
=7
;
(5)1?(?
)+(?
)?
=1+
-
-
=1+
-
-
=1-
=
;
(6)|5
?3
|+4
?
=5
-3
+4
-
=5
-
+4
-3
=5+1
=6.
=-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 |
=0.85+0.75-2
3 |
4 |
=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 |
4 |
17 |
4 |
17 |
1 |
11 |
=5
1 |
11 |
4 |
17 |
4 |
17 |
1 |
11 |
=5
1 |
11 |
1 |
11 |
4 |
17 |
4 |
17 |
=5+1
=6.
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