问题 解答题
3÷〔9×(
1
27
-
1
36
)〕×12
93.6÷〔(6-2.88)×(5
7
8
-1.875)〕
7.05×37+64×7.05-7.05
(2
2
9
×
4
5
+2
2
9
×6.2-5.8×2
2
9
-
1
5
÷
9
20
9
20

8
4
5
÷〔7.8+
1
4
×(2.75+1.25)〕
8.1÷(4
1
7
-0.05×70
)÷1
2
7
答案

(1)3÷[9×(

1
27
-
1
36
)]×12,

=3÷[9×

1
27
-
1
36
×9]×12,

=3÷[

1
3
-
1
4
]×12,

=3÷

1
12
×12,

=36×12,

=432;

(2)93.6÷[(6-2.88)×(5

7
8
-1.875)],

=93.6÷[3.12×4],

=93.6÷12.48,

=7.5;

(3)7.05×37+64×7.05-7.05,

=7.05×(37+64-1),

=7.05×100,

=705;

(4)(2

2
9
×
4
5
+2
2
9
×6.2-5.8×2
2
9
-
1
5
÷
9
20
9
20

=(

20
9
×0.8+
20
9
×6.2-5.8×
20
9
-
20
9
×0.2)×
9
20

=[

20
9
×(0.8+6.2-5.8-0.2)]×
9
20

=[

20
9
×1]×
9
20

=

20
9
×
9
20

=1;

(5)8

4
5
÷[7.8+
1
4
×(2.75+1.25)],

=8

4
5
÷[7.8+
1
4
×4],

=8

4
5
÷(7.8+1),

=8.8÷8.8,

=1;

(6)8.1÷(4

1
7
-0.05×70)÷1
2
7

=8.1÷(4

1
7
-3.5)÷1
2
7

=

81
10
÷
9
14
÷
9
7

=

81
10
×
14
9
×
7
9

=

49
5

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