问题 解答题
(
5
8
+
2
27
)×8+
11
27

1
2
÷[
2
3
×(
1
6
+
1
3
)]

2.5×3+0.8
16×1.5+0.9
×
9
11
-
7
33

999
8
9
+99
8
9
+9
8
9
+
1
3
答案

(1)(

5
8
+
2
27
)×8+
11
27

=

5
8
×8+
2
27
×
8+
11
27

=5+1,

=6;

(2)

1
2
÷[
2
3
×(
1
6
+
1
3
)],

=

1
2
÷[
2
3
×
1
6
+
2
3
×
1
3
],

=

1
2
÷
1
3

=

1
2
×3,

=1

1
2

(3)

2.5×3+0.8
16×1.5+0.9
×
9
11
-
7
33

=

25×3+8
16×15+9
×
9
11
-
7
33

=

1
3
×
9
11
-
7
33

=

3
11
-
7
33

=

2
33

(4)999

8
9
+99
8
9
+9
8
9
+
1
3

=999+99+9+

8
9
×3+
1
3

=999+99+9+3,

=(999+1)+(99+1)+(9+1),

=1000+100+10,

=1110.

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