题目内容
计算:
(1)(-26)+(-73);
(2)(+15)+(-8);
(3)(-23)+(+7);
(4)
+(-
);
(5)-3
+4.8;
(6)(-1
)+
;
(7)(-8
)+6
.
(1)(-26)+(-73);
(2)(+15)+(-8);
(3)(-23)+(+7);
(4)
| 8 |
| 5 |
| 2 |
| 5 |
(5)-3
| 1 |
| 2 |
(6)(-1
| 1 |
| 2 |
| 5 |
| 6 |
(7)(-8
| 2 |
| 3 |
| 1 |
| 2 |
分析:原式各项利用加法法则计算即可得到结果.
解答:解:(1)原式=-(26+73)
=-99;
(2)原式=+(15-8)
=7;
(3)原式=-(23-7)
=-16;
(4)原式=
;
(5)原式=1.3;
(6)原式=-
+
=-
;
(7)原式=-8
+6
=-2
.
=-99;
(2)原式=+(15-8)
=7;
(3)原式=-(23-7)
=-16;
(4)原式=
| 6 |
| 5 |
(5)原式=1.3;
(6)原式=-
| 9 |
| 6 |
| 5 |
| 6 |
=-
| 2 |
| 3 |
(7)原式=-8
| 4 |
| 6 |
| 3 |
| 6 |
=-2
| 1 |
| 6 |
点评:此题考查了有理数的加法,熟练掌握加法法则是解本题的关键.
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