早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算(1)-3-4+19-11+2(2)3×(-4)+(-28)÷7(3)(12−56−29)×36(4)123×(−49)×(−2.5)÷(−253)(5)|−115|÷(13−15)−13×(−3)2(6)1−12×[3×(−23)2−(−1)4]+14÷(−12)3.

题目详情
计算
(1)-3-4+19-11+2
(2)3×(-4)+(-28)÷7
(3)(
1
2
5
6
2
9
)×36
(4)1
2
3
×(−
4
9
)×(−2.5)÷(−
25
3
)
(5)|−1
1
5
|÷(
1
3
1
5
)−
1
3
×(−3)2
(6)1−
1
2
×[3×(−
2
3
)2−(−1)4]+
1
4
÷(−
1
2
)3.
▼优质解答
答案和解析
(1)-3-4+19-11+2,
=(-3-4-11)+(19+2),
=-(3+4+11)+(19+2),
=-18+21,
=3;

(2)3×(-4)+(-28)÷7,
=-12+(-4),
=-16;

(3)(
1
2
-
5
6
-
2
9
)×36,
=
1
2
×36-
5
6
×36-
2
9
×36,
=18-30-8,
=18-38,
=-20;

(4)1
2
3
×(-
4
9
)×(-2.5)÷(-
25
3
),
=
5
3
×(-
4
9
)×(-
5
2
)×(-
3
25
),
=-
5
3
×
4
9
×
5
2
×
3
25

=-
2
9


(5)|-1
1
5
|÷(
1
3
-
1
5
)-
1
3
×(-3)2
=|-
6
5
2
15
-
1
3
×9,
=
6
5
×
15
2
-3,
=9-3,
=6;

(6)1-
1
2
×[3×(-
2
3
2-(-1)4]+
作业帮用户 2016-12-09