题目内容

递等式计算(能简算的要简算)
1
8
×58+
1
8
×41+
1
8

4
5
×
4
7
×
5
4
-
1
2

4
5
×
5
6
+
2
5
÷
3
5

4
5
÷[(
5
8
-
1
2
)÷
5
8
].
(1)
1
8
×58+
1
8
×41+
1
8

=
1
8
×(58+41+1),
=
1
8
×100,
=12.5;

(2)
4
5
×
4
7
×
5
4
-
1
2

=
4
5
×
5
4
×
4
7
-
1
2

=1×
4
7
-
1
2

=
4
7
-
1
2

=
1
14


(3)
4
5
×
5
6
+
2
5
÷
3
5

=
2
3
+
2
5
÷
3
5

=
2
3
+
2
3

=
4
3


(4)
4
5
÷[(
5
8
-
1
2
)÷
5
8
],
=
4
5
÷[
1
8
÷
5
8
],
=
4
5
÷
1
5

=4.
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