题目内容

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
(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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