问题 解答题
神机妙算细又巧.(能用简便方法的用简便方法计算)
18÷(
1
2
-
1
3
)                
(0.75-
3
16
)×(
2
9
+
1
3
)           
2-
6
13
÷
9
26
+
2
3
7
10
×
4
9
+
4
9
×
2
10
3
5
÷[(
1
5
+
1
3
)÷
2
9
]
2
3
-
1
2
+
1
6
)÷
1
48
答案

(1)18÷(

1
2
-
1
3
),

=18÷

1
6

=18×6,

=108;

(2)(0.75-

3
16
)×(
2
9
+
1
3
),

=(

3
4
-
3
16
)×(
2
9
+
1
3
),

=

9
16
×
5
9

=

5
16

(3)2-

6
13
÷
9
26
+
2
3

=2-

6
13
×
26
9
+
2
3

=2-

4
3
+
2
3

=2-(

4
3
-
2
3
),

=2-

2
3

=1

1
3

(4)

7
10
×
4
9
+
4
9
×
2
10

=(

7
10
+
2
10
)×
4
9

=

9
10
×
4
9

=

2
5

(5)

3
5
÷[(
1
5
+
1
3
)÷
2
9
]

=

3
5
÷[
8
15
÷
2
9
],

=

3
5
÷[
8
15
×
9
2
],

=

3
5
÷
12
5

=

3
5
×
5
12

=

1
4

(6)(

2
3
-
1
2
+
1
6
)÷
1
48

=(

2
3
-
1
2
+
1
6
)×48,

=

2
3
×48-
1
2
×48+
1
6
×48,

=32-24+8,

=16.

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