题目内容

计算(能简算的要简算,写出计算过程)
(1)
5
3
÷
4
5
-
5
4
×
2
3

(2)[4
4
7
-(3
4
5
-2
2
3
15
7
14
15

(3)12
9
22
÷6
1
2
×[2
4
7
+(24.4-24
8
45
)]

(4)2+4
1
6
+6
1
12
+8
1
20
+10
1
30
+12
1
42

(5)12345678912-1234567890×1234567892
(6)
1
3
+
1
15
+
1
35
+
1
63
+…+
1
399

(1)
5
3
÷
4
5
-
5
4
×
2
3

=
5
3
×
5
4
-
5
4
×
2
3

=(
5
3
-
2
3
)×
5
4

=1×
5
4

=
5
4


(2)[4
4
7
-(3
4
5
-2
2
3
15
7
14
15

=[4
4
7
-(
19
5
-
8
3
15
7
14
15

=[4
4
7
-(
19
5
×
15
7
-
8
3
×
15
7
)]÷
14
15

=[
32
7
-(
57
7
-
40
7
)]÷
14
15

=[
32
7
-
17
7
14
15

=
15
7
×
15
14

=
225
98


(3)12
9
22
÷6
1
2
×[2
4
7
+(24.4-24
8
45
)]

=12
9
22
÷6
1
2
×[2
4
7
+
2
9
]

=
273
22
×
2
13
×
176
63

=
16
3


(4)2+4
1
6
+6
1
12
+8
1
20
+10
1
30
+12
1
42

=(2+4+6+8+10+12)+(
1
6
+
1
12
+
1
20
+
1
30
+
1
42

=(2+12)×6÷2+(
1
2×3
+
1
3×4
+
1
4×5
+
1
5×6
+
1
6×7
),
=42+(
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7
),
=42+(
1
2
-
1
7
),
=42+
5
14

=42
5
14


(5)12345678912-1234567890×1234567892,
=12345678912-(1234567891-1)(1234567891+1),
=12345678912-(12345678912-1),
=12345678912-12345678912+1,
=1;

(6)
1
3
+
1
15
+
1
35
+
1
63
+…+
1
399

=
1
1×3
+
1
3×5
+
1
5×7
+
1
7×9
+…+
1
19×21
 

=
1
2
×(1-
1
3
+
1
3
-
1
5
+
1
5
-
1
7
+
1
7
-
1
9
+…+
1
19
-
1
21
)

=
1
2
×(1-
1
21
),
=
1
2
×
20
21

=
10
21
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