问题 解答题
0.125×32×25128×99
32
3
-(3.14+
2
3
5
6
-
3
4
)÷
5
12
+
9
5
4
7
+
3
8
+
1
8
+
5
7
1
2
+
1
3
÷
2
3
10.9-1.6-3
2
5
1
4
÷(
4
3
-
1
2
4
25
÷
25
12
6.5×99+6.5
1
2
+
1
3
+
1
6
)×24
123×5.67+8.77×567
2-
7
15
×
9
14
2-
5
11
÷
9
22
-
8
9
3
4
÷(1-
1
2
-
3
8
49×
5
48
2
3
+
1
8
)×(1-
9
19
9
3
4
+99
3
4
+999
3
4
+9999
3
4
答案

(1)0.125×32×25,

=(0.125×8)×(4×25),

=1×100,

=100;

(2)128×99,

=128×(100-1),

=128×100-128×1,

=12800-128,

=12672;

(3)

32
3
-(3.14+
2
3
),

=10

2
3
-3.14-
2
3

=10-3.14,

=6.86;

(4)(

5
6
-
3
4
)÷
5
12
+
9
5

=

5
6
÷
5
12
-
3
4
÷
5
12
+
9
5

=2-

9
5
+
9
5

=2;

(5)

4
7
+
3
8
+
1
8
+
5
7

=(

4
7
+
5
7
)+(
3
8
+
1
8
),

=

9
7
+
1
2

=1

11
14

(6)

1
2
+
1
3
÷
2
3

=

1
2
+
1
2

=1;

(7)10.9-1.6-3

2
5

=10.9-(1.6+3.4),

=10.9-5,

=5.9;

(8)

1
4
÷(
4
3
-
1
2
),

=

1
4
÷
5
6

=0.3;

(9)2÷

4
25
÷
25
12

=2÷(

4
25
×
25
12
),

=2÷

1
3

=6;

(10)6.5×99+6.5,

=6.5×(99+1),

=6.5×100,

=650;

(11)(

1
2
+
1
3
+
1
6
)×24,

=

1
2
×24+
1
3
×24+
1
6
×24,

=12+8+4,

=20+4,

=24;

(12)123×5.67+8.77×567,

=5.67×(123+877),

=5.67×1000,

=5670;

(13)2-

7
15
×
9
14

=2-0.3,

=1.7;

(14)2-

5
11
÷
9
22
-
8
9

=2-(

10
9
+
8
9
),

=2-2,

=0;

(15)

3
4
÷(1-
1
2
-
3
8
),

=

3
4
÷(
1
2
-
3
8
),

=

3
4
÷
1
8

=6;

(16)49×

5
48

=(48+1)×

5
48

=48×

5
48
+1×
5
48

=5+

5
48

=5

5
48

(17)(

2
3
+
1
8
)×(1-
9
19
),

=

19
24
×
10
19

=

5
12

(18)9

3
4
+99
3
4
+999
3
4
+9999
3
4

=(9+99+999+9999)+(

3
4
×4),

=9+(99+1)+(999+1)+(9999+1),

=9+100+1000+10000,

=11109.

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