早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算:(1)(-85)×(-25)×(-4);(2)-215×2311÷(−212);(3)(−124)÷(134−78+712);(4)(79−56+34−718)×36.

题目详情
计算:
(1)(-85)×(-25)×(-4);
(2)-2
1
5
×2
3
11
÷(−2
1
2
); 
(3)(−
1
24
)÷(1
3
4
7
8
+
7
12
);
(4)(
7
9
5
6
+
3
4
7
18
)×36.
▼优质解答
答案和解析
(1)(-85)×(-25)×(-4),
=(-85)×[(-25)×(-4)],
=-85×100,
=-8500;

(2)-2
1
5
×2
3
11
÷(-2
1
2
),
=-
11
5
×
25
11
×(-
2
5
),
=2;

(3)(-
1
24
)÷(1
3
4
-
7
8
+
7
12
),
=(-
1
24
)÷(
42
24
-
21
24
+
14
24
),
=(-
1
24
)÷
11
24

=(-
1
24
)×
24
11

=-
1
11


(4)(
7
9
-
5
6
+
3
4
-
7
18
)×36,
=
7
9
×36-
5
6
×36+
3
4
×36-
7
18
×36,
=28-30+27-14,
=55-44,
=11.