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计算:(1)(78.6-0.786×25+75%×21.4)÷15×2001(2)1.65÷(14+0.8)-(0.5+13)×2435(3)(2514×23-62.5%)÷[(1312+6.375)÷111415](4)2-(716×223+17)×11011÷(1213-3.75÷514)

题目详情
计算:
(1)(78.6-0.786×25+75%×21.4)÷15×2001
(2)1.65÷(
1
4
+0.8)-(0.5+
1
3
)×
24
35

(3)(2
5
14
×
2
3
-62.5%)÷[(
13
12
+6.375)÷11
14
15
]
(4)2-(
7
16
×2
2
3
+
1
7
)×1
10
11
÷(12
1
3
-3.75÷
5
14
▼优质解答
答案和解析
(1)(78.6-0.786×25+75%×21.4)÷15×2001
=(0.786×100-0.786×25+0.75×21.4)÷15×2001
=[0.786×(100-25)+75×0.214]÷15×2001
=[0.786×75+75×0.214]÷15×2001
=(0.786+0.214)×75÷15×2001
=1×75÷15×2001
=5×2001
=10005;
(2)1.65÷(
1
4
+0.8)-(0.5+
1
3
)×
24
35

=
33
20
÷(
1
4
+
4
5
)-(
1
2
+
1
3
)×
24
35

=
33
20
÷
21
20
-
5
6
×
24
35

=
11
7
-
4
7

=1;
(3))(2
5
14
×
2
3
-62.5%)÷[(
13
12
+6.375)÷11
14
15
]
=(
33
14
×
2
3
5
8
)÷[(
13
12
+
51
8
)÷
179
15
]
=(
11
7
-
5
8
)÷[
179
24
÷
179
15
]
=
53
56
÷
5
8

=
53
35

(4)2-(
7
16
×2
2
3
+
1
7
)×1
10
11
÷(12
1
3
-3.75÷
5
14

=2-(
7
6
+
1
7
)×
21
11
÷(
37
3
-
21
2

=2-
55
42
×
21
11
÷
11
6

=2-
5
2
÷
11
6

=2-
15
11

=
7
11