问题 解答题
怎样算简便就怎样算.
(1)9×
5
18
+
13
18
×9
(2)
5
3
-
5
9
×
3
2
-
1
6
(3)
1
8
÷[
1
25
×(
2
5
+
1
10
)]
(4)(
5
8
+
1
27
)×8+
19
27
答案

(1)9×

5
18
+
13
18
×9,

=(

5
18
+
13
18
)×9,

=1×9,

=9;

(2)

5
3
-
5
9
×
3
2
-
1
6

=

5
3
-
5
6
-
1
6

=

5
3
-(
5
6
+
1
6
),

=

5
3
-1,

=

2
3

(3)

1
8
÷[
1
25
×(
2
5
+
1
10
)],

=

1
8
÷[
1
25
×
1
2
],

=

1
8
÷
1
50

=

25
4

(4)(

5
8
+
1
27
)×8+
19
27

=

5
8
×8+
1
27
×8+
19
27

=5+

8
27
+
19
27

=5+(

8
27
+
19
27
),

=5+1,

=6.

单项选择题
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