问题 解答题
计算:
5.61-
2
5
+4.39-1
3
5
4
15
÷[1-(
1
5
+
1
3
)]
5
7
×
7
24
+
1
9
÷
4
9
)×6
5
8
×
14
15
+
5
8
÷15.
答案

(1)5.61-

2
5
+4.39-1
3
5

=5.61+4.39-

2
5
-1
3
5

=(5.61+4.39)-(

2
5
+1
3
5
),

=10-2,

=8;

(2)

4
15
÷[1-(
1
5
+
1
3
)],

=

4
15
÷[1-
8
15
],

=

4
15
÷
7
15

=

4
15
×
15
7

=

4
7

(3)(

5
7
×
7
24
+
1
9
÷
4
9
)×6,

=(

5
24
+
1
4
)×6,

=

11
24
×6,

=

11
4

(4)

5
8
×
14
15
+
5
8
÷15,

=

5
8
×
14
15
+
5
8
×
1
15

=

5
8
×(
14
15
+
1
15
),

=

5
8
×1,

=

5
8

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