计算:(1)25+(-35);(2)(-13)+(-23);(3)(-13)+25;(4)(-56)+(-38);(5)12+(-223);(6)(-12)+(-113);(7)(-113)+(-21

题目简介

计算:(1)25+(-35);(2)(-13)+(-23);(3)(-13)+25;(4)(-56)+(-38);(5)12+(-223);(6)(-12)+(-113);(7)(-113)+(-21

题目详情

计算:
(1)
2
5
+(-
3
5
);
(2)(-
1
3
)+(-
2
3
);
(3)(-
1
3
)+
2
5

(4)(-
5
6
)+(-
3
8
);
(5)
1
2
+(-2
2
3
);
(6)(-
1
2
)+(-1
1
3
);
(7)(-1
1
3
)+(-2
1
6
);
(8)3
1
4
+(-1
1
12
).
题型:解答题难度:中档来源:不详

答案

(1)原式=class="stub"2
5
-class="stub"3
5
=-class="stub"1
5

(2)原式=-class="stub"1
3
-class="stub"2
3
=-1;
(3)原式=-class="stub"5
15
+ class="stub"6
15
=class="stub"1
15

(4)原式=-class="stub"20
24
- class="stub"9
24
=-class="stub"29
24

(5)原式=class="stub"1
2
-class="stub"8
3
=class="stub"3
6
- class="stub"16
6
=-2class="stub"1
6

(6)原式=-class="stub"1
2
-class="stub"4
3
=-class="stub"3
6
- class="stub"8
6
=-1class="stub"5
6

(7)原式=-class="stub"4
3
-class="stub"13
6
=-class="stub"8
6
-class="stub"13
6
=-class="stub"21
6
=-3class="stub"1
2

(8)原式=class="stub"13
4
-class="stub"13
12
=class="stub"39
12
-class="stub"13
12
=class="stub"13
6
=2class="stub"1
6

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