题目内容

递等式计算(能简算的要简算).
(1)168.1÷(4.3×2-0.4)
(2)(
4
5
+
1
4
)÷
7
3
+
7
10

(3)
5
7
×
1
7
+
5
7
÷
7
5
(1)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;

(2)(
4
5
+
1
4
)÷
7
3
+
7
10

=
21
20
×
3
7
+
7
10

=
9
20
+
7
10

=
23
20


(3)
5
7
×
1
7
+
5
7
÷
7
5

=
5
7
×
1
7
+
5
7
×
5
7

=(
1
7
+
5
7
)×
5
7

=
6
7
×
5
7

=
30
49
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