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计算下列各题,能简算的要简算(1)91100×17+9100÷7+17(2)3-78÷(14+25%)]÷18(3)445÷4+525×14+0.25(4)15÷[815×(56+23)+112].

题目详情
计算下列各题,能简算的要简算
(1)
91
100
×
1
7
+
9
100
÷7+
1
7

(2)3-
7
8
÷(
1
4
+25%)]÷
1
8

(3)4
4
5
÷4+5
2
5
×
1
4
+0.25
(4)15÷[
8
15
×(
5
6
+
2
3
)+1
1
2
].
▼优质解答
答案和解析

(1)
91
100
×
1
7
+
9
100
÷7+
1
7

=
91
100
×
1
7
+
9
100
×
1
7
+
1
7

=(
91
100
+
9
100
+1)×
1
7

=2×
1
7

=
2
7


(2)[3-
7
8
÷(
1
4
+25%)]÷
1
8

=[3-
7
8
÷
1
2
1
8

=[3-
7
4
1
8

=1
1
4
÷
1
8

=10;

(3)4
4
5
÷4+5
2
5
×
1
4
+0.25,
=4
4
5
×
1
4
+5
2
5
×
1
4
+
1
4

=(4
4
5
+5
2
5
+1)×
1
4

=11
1
5
×
1
4

=
14
5


(4)15÷[
8
15
×(
5
6
+
2
3
)+1
1
2
],
=15÷[
8
15
×
3
2
+1
1
2
],
=15÷[
4
5
+1
1
2
],
=15÷
23
10

=
150
23