问题 解答题
计算各题,能简便运算的要写出简算过程.
[1-(
1
4
+
3
8
)]÷
1
4

36×(
1
4
+
1
6
+
1
9

85×
3
86
=
3
5
×17+13×
3
5
=
1
3
+
1
4
-
1
24
)×24
4
9
÷[
5
6
-(
1
3
-
1
6
)].
答案

(1)[1-(

1
4
+
3
8
)]÷
1
4

=[1-

5
8
1
4

=

3
8
÷
1
4

=1.5;

(2)36×(

1
4
+
1
6
+
1
9

=36×

1
4
+36×
1
6
+36×
1
9

=9+6+4

=19;

(3)85×

3
86

=86×

3
86
-1×
3
86

=3-

3
86

=2

83
86

(4)

3
5
×17+13×
3
5

=(17+13)×

3
5

=30×

3
5

=18;

(5)(

1
3
+
1
4
-
1
24
)×24

=

1
3
×24+
1
4
×
24-
1
24
×
24

=8+6-1

=13;

(6)

4
9
÷[
5
6
-(
1
3
-
1
6
)]

=

4
9
÷[
5
6
+
1
6
-
1
3
]

=

4
9
÷[1-
1
3
]

=

4
9
÷
2
3

=

2
3

单项选择题
单项选择题