问题 解答题
下面各题,怎样算简便就怎样算.
(1)
11
10
-
1
4
-
3
4
+
9
10

(2)87×
7
88

(3)
5
9
÷5+5÷
5
9

(4)
4
15
÷(
13
9
-
2
3
×
5
6
答案

(1)

11
10
-
1
4
-
3
4
+
9
10

=(

11
10
+
9
10
)-(
1
4
+
3
4
),

=2-1,

=1;

(2)87×

7
88

=(88-1)×

7
88

=7-

7
88

=6

81
88

(3)

5
9
÷5+5÷
5
9

=

5
9
×
1
5
+5×
9
5

=

1
9
+9,

=9

1
9

(4)

4
15
÷(
13
9
-
2
3
×
5
6
),

=

4
15
÷(
13
9
-
5
9
),

=

4
15
×
9
8

=

3
10

单项选择题
单项选择题