问题 解答题
简便计算:
8
13
×
1
7
+
5
7
×
1
13
12÷[(
5
6
-
1
3
)×3]
24×(
1
4
+
1
6
-
1
3
)
4.5×7.3+4
1
2
×2.7
1-3
1
11
÷
4
3
×
3
4
÷
34
11
(1-
1
30
)÷(
2
3
-
1
10
+
1
6
-
2
5
).
答案

(1)

8
13
×
1
7
+
5
7
×
1
13

=

8
13
×
1
7
+
1
7
×
5
13

=(

8
13
+
5
13
)×
1
7

=1×

1
7

=

1
7

(2)12÷[(

5
6
-
1
3
)×3],

=12÷[

5
6
×3-
1
3
×3],

=12÷[

5
2
-1],

=12÷

3
2

=8;

(3)24×(

1
4
+
1
6
-
1
3
),

=24×

1
4
+24×
1
6
-24×
1
3

=6+4-8,

=10-8,

=2;

(4)4.5×7.3+4

1
2
×2.7,

=4.5×(7.3+2.7),

=4.5×10,

=45;

(5)1-3

1
11
÷
4
3
×
3
4
÷
34
11

=1-

34
11
×
3
4
×
3
4
×
11
34

=1-(

34
11
×
11
34
)×(
3
4
×
3
4
),

=1-1×

9
16

=1-

9
16

=

7
16

(6)(1-

1
30
)÷(
2
3
-
1
10
+
1
6
-
2
5
),

=(1-

1
30
)÷[(
2
3
+
1
6
)-(
1
10
+
2
5
)],

=

29
30
÷[
5
6
-
1
2
],

=

29
30
÷
1
3

=

29
10

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