问题 解答题
计算下列各题,能简算的要简算.
1
12
+[(
1
6
+
1
12
)+
1
3
]
28×
26
27
9
14
-(
2
7
+
3
14
85×
3
86
236÷
5
9
+236÷
5
41
5
9
×
8
15
÷
4
9
45÷(1-
2
5
)÷(1-
3
8
答案

(1)

1
12
+[(
1
6
+
1
12
)+
1
3
],

=

1
12
+[(
2
12
+
1
12
)+
1
3
],

=

1
12
+[(
2
12
+
1
12
)+
4
12
],

=

1
12
+
7
12

=

2
3

(2)28×

26
27

=(27+1)×

26
27

=27×

26
27
+
26
27

=26+

26
27

=26

26
27

(3)

9
14
-(
2
7
+
3
14
),

=

9
14
-
2
7
-
3
14

=

9
14
-
4
14
-
3
14

=

1
7

(4)85×

3
86

=(86-1)×

3
86

=86×

3
86
-
3
86

=3-

3
86

=2

83
86

(5)236÷

5
9
+236÷
5
41

=236×

9
5
+236×
41
5

=236×(

9
5
+
41
5
),

=236×10,

=2360;

(6)

5
9
×
8
15
÷
4
9

=

5
9
×
8
15
×
9
4

=

2
3

(7)45÷(1-

2
5
)÷(1-
3
8
),

=45÷

3
5
÷
5
8

=45×

5
3
×
8
5

=120.

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