> 数学 >
4
5
+(
7
8
4
5
)

7
10
−(
2
15
+
1
6
)

1−
1
3
1
7
人气:184 ℃ 时间:2019-09-10 08:59:27
解答
(1)
4
5
+(
7
8
-
4
5
),
=
4
5
+
7
8
-
4
5

=
4
5
-
4
5
+
7
8

=
7
8

(2)
7
10
-(
2
15
+
1
6
),
=
7
10
-
3
10

=
2
5

(3)1-
1
3
-
1
7

=1-
7
21
-
3
21

=
11
21
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