当前位置:初中试题 > 数学试题 > 有理数的运算 > 计算:(1)(+12)+(-14)-(-56)+(-27);(2)(-3.2)-(-8.1)-(+16.9)+(-1215);(3)(+325)+(-278)-...
题目
题型:解答题难度:一般来源:不详
计算:
(1)(+12)+(-14)-(-56)+(-27);
(2)(-3.2)-(-8.1)-(+16.9)+(-1
2
15
)

(3)(+3
2
5
)+(-2
7
8
)-(+3
5
12
)-(-5
3
5
)+(-1
1
8
)-
(-5
5
12
)

(4)|-0.75|+(+3
1
4
)-9-(-0.125)+(-
5
8
)-|-0.125|
答案
(1)原式=12+(-14)+56+(-27),
=12+56+(-14)+(-27),
=68+(-41),
=27;

(2)原式=(-3.2)+8.1+(-16.9)+(-1
2
15
),
=(-3.2)+(-16.9)+8.1+(-1
2
15
),
=-12+(-1
2
15
),
=-13
2
15


(3)原式=3
2
5
+(-2
7
8
)+(-3
5
12
)+5
3
5
+(-1
1
8
)+5
5
12

=3
2
5
+5
3
5
+(-2
7
8
)+(-1
1
8
)+5
5
12
+(-3
5
12
),
=9-4+2,
=7;

(4)原式=
3
4
+3
1
4
-9+
1
8
+(-
5
8
)-
1
8

=4-9-
5
8

=-5
5
8
核心考点
试题【计算:(1)(+12)+(-14)-(-56)+(-27);(2)(-3.2)-(-8.1)-(+16.9)+(-1215);(3)(+325)+(-278)-】;主要考察你对有理数的运算等知识点的理解。[详细]
举一反三
计算:
(1)(-3)+(-4)-(+11)-(-9);
(2)-
1
6
×5-
1
6
×(-4)+
1
6
×(-8)

(3)-6÷(-0.25)×
11
24
÷2

(4)[-32×(-
1
3
)
2
-0.8]×4
1
2
÷(-5
1
4
)
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A.-5+(+3)+(+6)+(-2)B.-5+(-3)+(+6)+(+2)
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