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计算:(1)-7+13-6+20(2)(-49)-(+91)-(-5)+(-9)(3)(-5)×6+(-125)÷(-5)(4)1+(-2)+|-2-3|-5;(5)8+2×32-(-2×3)2(6)−12012×[(−2)5−32−514÷(−17)]−2.5.

题目详情
计算:
(1)-7+13-6+20
(2)(-49)-(+91)-(-5)+(-9)
(3)(-5)×6+(-125)÷(-5)
(4)1+(-2)+|-2-3|-5;
(5)8+2×32-(-2×3)2
(6)12012×[(−2)5−32−
5
14
÷(−
1
7
)]−2.5.





22
12012×[(−2)5−32−
5
14
÷(−
1
7
)]−2.5.
12012×[(−2)5−32−
5
14
÷(−
1
7
)]−2.5.
12012×[(−2)5−32−
5
14
÷(−
1
7
)]−2.5.
2012×[(−2)5−32−
5
14
÷(−
1
7
)]−2.5.
)5−32−
5
14
÷(−
1
7
)]−2.5.
)5−32−
5
14
÷(−
1
7
)]−2.5.
5−32−
5
14
÷(−
1
7
)]−2.5.
32−
5
14
÷(−
1
7
)]−2.5.
32−
5
14
÷(−
1
7
)]−2.5.
2−
5
14
÷(−
1
7
)]−2.5.
5
14
551414
1
7
1177
▼优质解答
答案和解析
(1)原式=-13+13+20
=20;
(2)原式=-49-91+5-9
=-144;
(3)原式=-30+25
=-5;
(4)原式=1+(-2)+5-5
=-1;
(5)原式=8+2×9-36
=8+18-36
=-10;
(6)原式=-1×(-32-9+
5
2
)-2.5
=38.5-2.5
=36.
5
2
555222)-2.5
=38.5-2.5
=36.