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![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( 10 + 10 ) - ( 9,34 + 9 , 66 )
= 20 - 19
= 1
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 72,64 - (18,35 + 9,29)
= 72,64 - 18,35 -, 9,29
= (72,64 - 9,29) - 18,35
= 63,35 - 18,35
= 45
b) 45,83 - 8,46 - 7,37
= (45,83 - 7,37) - 8,46
= 38,46 - 8,46
= 30
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(72,64-\left(18,35+9,29\right)\)
\(=72,64-27,64\)
\(=45\)
b) \(45,83-8,46-7,37\)
\(=37,37-7,37\)
\(=30\)
a) 72,64 - (18,35 + 9,29)
= 72,64 - 27,64
= 45
b) 45,83 - 8,46 - 7,37
= 45,83 - (8,46 + 7,37)
= 45,83 - 15,83
= 30
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 72,64 - (18,35 + 9,29)
= 72,64 - 18,35 -, 9,29
= (72,64 - 9,29) - 18,35
= 63,35 - 18,35
= 45
b) 45,83 - 8,46 - 7,37
= (45,83 - 7,37) - 8,46
= 38,46 - 8,46
= 30
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 72,64 - (18,35 + 9,29)
= 72,64 - 27,64
= 45
b, 45,83 - 8,46 - 7,37
= 45,83 - (8,46 + 7,37)
= 45,83 - 15,83
= 30
![](https://rs.olm.vn/images/avt/0.png?1311)
( 10 - 9,34) + (10 - 9,66) = 0,66 +0,34 =1
12 - (12 - 9,36)= 12 -2,64 = 9,36
**** cho mink nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
A; 72,64-(18,35 + 9,29)
=72,64 - 18,35 - 9,29
= 54,29-9,29
= 45
B; 45,83 - 8,46 - 7,37
= 37,37 -7,37
=30
![](https://rs.olm.vn/images/avt/0.png?1311)
1.
( 10 - 9,34 ) + ( 10 - 9,66 )
= 0,66 + 0,34
= 1
12 - ( 12 - 9,36 )
= 12 - 2,64
= 9,36
38,52 + 0,302 x 100 - 0,72
= 38,52 + 30,2 - 0,72
= 68,72 - 0,72
= 68
2.
\(1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\)
\(1-\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=0\)
\(\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=0+1=1\)
\(\left(x-\frac{151}{12}\right):\frac{50}{3}=1\)
\(x-\frac{151}{12}=1\times\frac{50}{3}\)
\(x-\frac{151}{12}=\frac{50}{3}\)
\(x=\frac{50}{3}+\frac{151}{12}\)
\(x=\frac{117}{4}\)
Bài 1
\(\left(10-9,34\right)+\left(10-9,66\right)\)
\(=0.66+0,34=1\)
\(12-\left(12-9,36\right)\)
\(=12-2.64=9,36\)
\(38,52+0,302.100-0,72\)
\(=38,52+30,2-0,72\)
\(=7.6\)
Bài 2
\(1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\)
\(1-\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=0\)
\(\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=1\)
\(\frac{43}{8}+x-\frac{173}{24}=\frac{3}{50}\)
\(\frac{43}{8}+x=\frac{3}{50}+\frac{173}{24}\)
\(\frac{43}{8}+x=\frac{4361}{600}\)
\(x=\frac{142}{75}\)( gửi lại bài 2 đã )
![](https://rs.olm.vn/images/avt/0.png?1311)
72,64 - [ 18, 35 + 9,29 ] = 72,64 - 27,64 = 45
45,83 - 8,46 - 7,73 = 45,83 - 7,73 - 8,46 = 38,1 - 8,46 = 29,64
a) =9,46
b) =45
c) =20,32
d) =34,9
Bài 2. Tính nhanh :
a) 12 – ( 12 – 9,36 )
= 12 - 2,64
= 9,36
b) 72,64 – 18,35 – 9,29
= 54,29 - 9,29
= 45
c) ( 10 – 9,34 ) + ( 10 + 9,66 )
= 0.66 + 19,66
= 20,32
d) 45,83 – 8,46 – 6, 54 + 4,17
= 37,37 - 10,71
= 26,66