问题 解答题
计算.(能简算的要用简便方法计算.)
5
12
×
7
25
×
3
14
7
9
÷
1
2
÷
35
36
1
14
×(
7
8
+7)
3
5
×
8
9
÷
5
8
5
6
×
1
4
+
5
6
×
3
4
96×
4
5
-36÷
5
4
+
4
5
×40
4
9
÷[(
1
3
-
1
9
)×2]
3
4
+
7
9
+
1
4
-
4
9
2
7
×
5
9
÷
2
7
×
5
9
11
12
-
3
7
)-(
4
7
-
7
12
3
5
×0.25+
3
5
×
3
4
答案

(1)

5
12
×
7
25
×
3
14

=

7
60
×
3
14

=

1
40

(2)

7
9
÷
1
2
÷
35
36

=

14
9
×
36
35

=

8
5

(3)

1
14
×(
7
8
+7),

=

1
14
×
7
8
+7×
1
14

=

1
16
+
1
2

=

9
16

(4)

3
5
×
8
9
÷
5
8

=

8
15
×
8
5

=

64
75

(5)

5
6
×
1
4
+
5
6
×
3
4

=

5
6
×(
1
4
+
3
4
),

=

5
6
×1,

=

5
6

(6)96×

4
5
-36÷
5
4
+
4
5
×40,

=96×

4
5
-36×
4
5
+
4
5
×40,

=(96-36+40)×

4
5

=100×

4
5

=80;

(7)

4
9
÷[(
1
3
-
1
9
)×2],

=

4
9
÷[
2
9
×2],

=

4
9
÷
4
9

=1;

(8)

3
4
+
7
9
+
1
4
-
4
9

=(

3
4
+
1
4
)+(
7
9
-
4
9
),

=1+

1
3

=1

1
3

(9)

2
7
×
5
9
÷
2
7
×
5
9

=

2
7
×
5
9
×
7
2
×
5
9

=(

2
7
×
7
2
)×(
5
9
×
5
9
),

=1×

25
81

=

25
81

(10)(

11
12
-
3
7
)-(
4
7
-
7
12
),

=

11
12
-
3
7
-
4
7
+
7
12

=(

11
12
+
7
12
)-(
3
7
+
4
7
),

=

3
2
-1,

=

1
2

(11)

3
5
×0.25+
3
5
×
3
4

=

3
5
×(0.25+
3
4
),

=

3
5
×1,

=

3
5

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