CHUYÊN ĐỀ : THỰC HIỆN PHÉP TÍNH
DẠNG 1: RÚT GỌN
Bài 1: Thực hiện phép tính:
a,
12
5
6
2
10
3
5
2
2
6
3
9
3
2 .3
4 .9
5 .7
25 .49
(2 .3)
(125.7)
5 .14
b,
18
7
3
15
15
10
15
14
13
2 .18 .3
3 .2
2 .6
3 .15.4
c,
6
5
9
4
12
11
4 .9
6 .120
8 .3
6
HD :
a, Ta có:
12
5
6
2
10
3
5
2
2
6
3
9
3
2 .3
4 .9
5 .7
25 .49
(2 .3)
(125.7)
5 .14
6
2
5
2
12
5
2
2
10
3
2
2
3
12
6
3
3
9
3
3
2 .3
2
.
3
5 .7
5
.
7
2 .3
5
.7
5 .2 .7
12
4
10
3
12
5
12
4
10
3
10
4
12
6
9
3
9
3
3
12
6
9
3
2 .3
3
1
5 .7
1
7
2 .3
2 .3
5 .7
5 .7
2 .3
5 .7
5 .2 .7
2 .3
5 .7
1
8
2
2
5.6
28
3
9
9
b, Ta có:
18
7
3
15
15
10
15
14
13
2 .18 .3
3 .2
2 .6
3 .15.4
18
7
14
3
15
15
25
17
15
15
10
15
15
14
28
25
15
15
28
2 .2 .3 .3
3 .2
2 .3
3 .2
2 .2 .3
3 .3.5.2
2 .3
3 .2 .5
15
15
10
2
10
2
10
25
15
3
2 .3
2 .3
1
2 .3
1
2 41
2 .3
1
2 .5
c, Ta có:
6
5
9
4
12
11
4 .9
6 .120
8 .3
6
=
6
5
2
2
9
9
3
12
10
12
10
4
12
12
11
11
3
12
11
11
2
.
3
2 .3 .2 .3.5
2 .3
2 .3 .5
2 .3
2 .3
2
.3
2 .3
12
10
11
11
2 .3
1
5
2.6
4
2 .3
2.3
1
3.5
5
Bài 2: Thực hiện phép tính:
a,
15
9
20
9
9
16
29
6
5.4 .9
4.3 .8
5.2 .9
7.2 .27
b,
4
2
2
3
3
2
2 .5 .11 .7
2 .5 .7 .11
c,
11
12
11
11
12
11
11
11
5 .7
5 .7
5 .7
9.5 .7
HD :
a, Ta có:
15
9
20
9
29
16
29
6
5.4 .9
4.3 .8
5.2 .3
7.2 .27
=
29
18
2
30
18
29
20
29
16
29
18
29
16
2
2 .3
5.2
3
5.2 .3
2 .3
5.2 .3
7.2 .3
2 .3
5
7.3
=
2
3
9
58
58
b, Ta có:
4
2
2
3
3
2
2 .5 .11 .7
2 .5 .7 .11
=
2.11
22
5.7
35
c, Ta có:
11
12
11
11
12
11
11
11
5 .7
5 .7
5 .7
9.5 .7
=
11
11
11
11
5 .7
7
1
8
4
5 .7
5
9
14
7
Bài 3: Thực hiện phép tính:
a,
22
7
15
14
2
11.3 .3
9
(2.3 )
b,
10
10
10
9
9
10
2 .3
2 .3
2 .3
c,
5
4
9
10
8
8
4 .9
2.6
2 .3
6 .20
HD :
a, Ta có:
22
7
15
14
2
11.3 .3
9
(2.3 )
=
29
29
30
2
28
2
28
3 .
11
3
11.3
3
3.8
6
2 .3
2 .3
4
b, Ta có:
10
10
10
9
9
10
2 .3
2 .3
2 .3
10
9
9
10
2 .3
3
1
2.2
4
2 .3
3
3
c, Ta có:
5
4
9
10
8
8
4 .9
2.6
2 .3
6 .20
10
8
10
8
10
9
10
8
10
8
10
8
2 .3
1
3
2 .3
2 .3
2
1
2 .3
2 .3 .5
2 .3
1
5
6
3
Bài 4: Thực hiện phép tính:
1
