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计算:(1)(-5)-(+3)+(-9)-(-7)+12;(2)10-23+32-17-21+45;(3)(-356)+(+225)-(+216)-(-735);(4)-9.2-(7.1)-(-3)+615+(+2.9);(5)3.6+41.8-1235-11-5145;(6)−18−25−49+238−35−

题目详情
计算:
(1)(-5)-(+3)+(-9)-(-7)+
1
2

(2)10-23+32-17-21+45;
(3)(-3
5
6
)+(+2
2
5
)-(+2
1
6
)-(-7
3
5
);
(4)-9.2-(7.1)-(-3)+6
1
5
+(+2.9);
(5)3.6+41.8-12
3
5
-11-51
4
5

(6)
1
8
2
5
4
9
+2
3
8
3
5
5
9
▼优质解答
答案和解析
(1)原式=-5-3-9+7+
1
2
=-9
1
2

(2)原式=26;
(3)原式=-
23
6
+
12
5
-
13
6
+
38
5
=-6+10=4;
(4)原式=-9.2-7.1+3+6.2+2.9=-4.2=-4
1
5

(5)原式=3.6+41.8-12.6-51.8=-19;
(6)原式=-
1
8
+
19
8
-
2
5
-
3
5
-
4
9
-
5
9
=
9
4
-2=
1
4