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混合运算[1−(14+38)]÷14(12.5×8-40)÷0.6731÷52+35×73115÷[(23+15)×113].

题目详情
混合运算
[1−(
1
4
+
3
8
)]÷
1
4
(12.5×8-40)÷0.6
7
31
÷
5
2
+
3
5
×
7
31
1
5
÷[(
2
3
+
1
5
1
13
].
▼优质解答
答案和解析
①[1-(
1
4
+
3
8
)]÷
1
4

=[1-
5
8
1
4

=
3
8
×4
=
3
2


②(12.5×8-40)÷0.6
=(100-40)÷0.6
=60÷0.6
=100

7
31
÷
5
2
+
3
5
×
7
31

=
7
31
×
2
5
+
3
5
×
7
31

=
7
31
×(
2
5
+
3
5

=
7
31
×1
=
7
31


1
5
÷[(
2
3
+
1
5
)×
1
13
]
=
1
5
÷[
13
15
×
1
13
]
=
1
5
÷
1
15

=
1
5
×15
=3