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`3/4-(2/3+3/4)+2/3+2022/2023`
`=3/4 - 2/3 - 3/4 +2/3 +2022/2023`
`= (3/4 -3/4 ) + (-2/3 +2/3) +2022/2023`
`= 0+0+2022/2023`
`=2022/2023`
\(\dfrac{3}{4}-\left(\dfrac{2}{3}+\dfrac{3}{4}\right)+\dfrac{2}{3}+\dfrac{2022}{2023}\)
\(=\dfrac{3}{4}-\left(\dfrac{8}{12}+\dfrac{9}{12}\right)+\dfrac{2}{3}+\dfrac{2022}{2023}\)
\(=\dfrac{3}{4}-\dfrac{17}{12}+\dfrac{2}{3}+\dfrac{2022}{2023}\)
\(=\dfrac{9}{12}-\dfrac{17}{12}+\dfrac{8}{12}+\dfrac{2022}{2023}\)
\(=\dfrac{9-17+8}{12}+\dfrac{2022}{2023}=\dfrac{0}{12}+\dfrac{2022}{2023}=0+\dfrac{2022}{2023}\)
\(=\dfrac{2022}{2023}\)
#YTVA
\(A=2+2^3+...+2^{2009}\)
\(2^2.A=2^3+2^5+...+2^{2011}\)
\(4A-A=\left(2^3+2^5+...+2^{2011}\right)-\left(2+2^3+...+2^{2009}\right)\)
\(3A=2^{2011}-2\)
\(\Rightarrow A=\frac{2^{2011}-2}{3}\)
a) 136.68+16.272
=136.68+16.4.68
=136.68+64.68
=68.(136+64)
=68.200
= 68.2.100
=136.100 = 13600
b) 36.333-108.111
=36.3.111-108.111
=108.111-108.111
=0
☆★☆★☆
\(\Leftrightarrow x\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{14}\right)=\dfrac{1}{21}\)
\(\Leftrightarrow x\cdot\dfrac{2}{7}=\dfrac{1}{21}\)
hay \(x=\dfrac{1}{21}:\dfrac{2}{7}=\dfrac{1}{6}\)
71-(33+x)=26
33+x=71-26
33+x=45
x=45-33
x=12
Vậy x=12
45-(x-9):2=6
(x-9):2=45-6
(x-9):2=39
x-9=39.2
x-9=78
x=78+9
x=87
Vậy x=87
\(77-\left(33+x\right)=26\\ \Rightarrow33+x=77-26=51\\ \Rightarrow x=51-33=18\\ 45-\left(x-9\right):2=6\\ \Rightarrow\left(x-9\right):2=45-6=39\\ \Rightarrow x-9=39\cdot2=78\\ \Rightarrow x=78+9=87\)
Ta có: x - 2/4 = 5 + x/3
x = (5 + x/3) + 2/4
x= x
x là: 5 - 3 = 2 ; 4 - 2 = 2
Vậy x là 2.
Không chắc đâu nha!
x - 2/4 = 5 + x/3
=> x - 2/4 = 5 + x.1/3
=> x - x.1/3 = 5 + 2/4
=> x.(1-1/3) = 11/2
=> 2/3.x = 11/2
=> x= 11/2 : 2/3
=> x = 33/4
[ ( 6 . x - 27 ) : 2 - 84 ] . 28 = 5628
[ ( 6 . x - 27 ) : 2 - 84 ] = 5628 : 28
( 6 . x - 27 ) : 2 - 84 = 201
( 6 . x - 27 ) : 2 = 201 + 84
( 6 . x - 27 ) : 2 = 285
( 6 . x - 27 ) = 285 . 2
6 . x - 27 = 570
6 . x = 570 + 27
6 . x = 597
x = 597 : 6
x = 99,5
[(6 . x - 27 ) : 2 - 84 ] . 28 = 5628
[( 6 . x - 27 ) : 2 - 84 ] = 5628 : 28
[( 6 . x - 27 ) : 2 - 84 ] = 201
( 6 . x - 27 ) : 2 = 201 + 84
( 6 . x - 27 ) : 2 = 285
( 6 . x - 27 ) = 285 x 2
(6 . x - 27 ) = 570
6 . x = 570 + 27
6 . x = 597
=> x = 597 : 6 = 99,5
13. \(A=\left\{0\right\}\)
14. Có vô hạn số tự nhiên không vượt quá n trong đó n thuộc N*
13.A={0} .
14.Có n số tự nhiên không vượt quá n .