计算:(1)7.5+(-213);(2)(+0.75)+(-2.8)+(-0.2)-1.25;(3)?13?(?212)+(?314)?(+516);(4
计算:(1)7.5+(-213);(2)(+0.75)+(-2.8)+(-0.2)-1.25;(3)?13?(?212)+(?314)?(+516);(4)-|?35?(...
计算:(1)7.5+(-213);(2)(+0.75)+(-2.8)+(-0.2)-1.25;(3)?13?(?212)+(?314)?(+516);(4)-|?35?(?25)|+|(?14)+(?12)|.
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(1)7.5+(-2
),
=
?
,
=
,
=
;
(2)(+0.75)+(-2.8)+(-0.2)-1.25,
=0.75-1.25-2.8-0.2,
=-0.5-3,
=-3.5;
(3)?
?(?2
)+(?3
)?(+5
),
=-
+
?
?
,
=?
+
,
=-
-
,
=-
;
(4)-|?
?(?
)|+|(?
)+(?
)|,
=-|-
|+|-
|,
=-
+
,
=
,
=
.
1 |
3 |
=
15 |
2 |
7 |
3 |
=
45?14 |
6 |
=
31 |
6 |
(2)(+0.75)+(-2.8)+(-0.2)-1.25,
=0.75-1.25-2.8-0.2,
=-0.5-3,
=-3.5;
(3)?
1 |
3 |
1 |
2 |
1 |
4 |
1 |
6 |
=-
1 |
3 |
5 |
2 |
13 |
4 |
31 |
6 |
=?
2+31 |
6 |
10?13 |
4 |
=-
11 |
2 |
3 |
4 |
=-
25 |
4 |
(4)-|?
3 |
5 |
2 |
5 |
1 |
4 |
1 |
2 |
=-|-
1 |
5 |
3 |
4 |
=-
1 |
5 |
3 |
4 |
=
?4+15 |
20 |
=
11 |
20 |
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