问题 解答题
计算
(1)3
4
9
-(2
11
17
-2
5
9
);
(2)(
2
3
+
7
9
×
9
28
)÷
11
12

(3)1
2
3
×[7
5
6
÷(14.625-3
1
8
)-4
1
3
].
答案

(1)3

4
9
-(2
11
17
-2
5
9

=3

4
9
+2
5
9
-2
11
17

=6-2

11
17

=3

6
17

(2)(

2
3
+
7
9
×
9
28
)÷
11
12

=(

2
3
+
1
4
)÷
11
12

=

11
12
×
12
11

=1;

(3)1

2
3
×[7
5
6
÷(14.625-3
1
8
)-4
1
3
]

=1

2
3
×[7
5
6
÷11.5-4
1
3
]

=1

2
3
×[
47
6
×
2
23
-4
1
3
]

=1

2
3
×[
47
69
-4
1
3
]

=

5
3
×(-
252
69

=-

140
23

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