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11 x X - 11 x 6 = 4 x X + 11
11 x x - 66 = 4 x X + 11
11 x X - 4 x X = 66 + 11
11 x X - 4 x X = 77
( 11 - 4 ) x X = 77
7 x X = 77
X = 77 : 7
X = 11
P/s : k mình nha !
11 x (X-6)=4 x X +11
=> 11 x X - 11 x 6=4 x X +11
=> 11 x X - 66 = 4 x X+11
=> 11 x X - 4 x X = 11+66
=> (11-4) x X = 77
=> 7 x X=77
=> X=77:7
=> X=11
\(11\left(x-6\right)=4x+11\Leftrightarrow11x-4x=11+66\Leftrightarrow7x=77\Leftrightarrow x=11\)
11(x-6)=4x+11
=>11x-4x=11+66
=>7x=77
=>x=77:7
=>x=11
vậy x=11
11x(X-6)=4xX+11
11xX-11x6=4xX+11
11xX-66=4xX+11
11xX=4xX+11+66
11xX-4xX=11+66
(11-4)xX=77
7xX=77
X=77:7
X=11
\(\dfrac{4\times x}{1\times5}\) + \(\dfrac{4\times x}{5\times9}\) + \(\dfrac{4\times x}{9\times13}\) + \(\dfrac{4\times x}{13\times17}\) = 16
\(x\times\left(\dfrac{4}{1\times5}+\dfrac{4}{5\times9}+\dfrac{4}{9\times13}+\dfrac{4}{13\times17}\right)\) = 16
\(x\) \(\times\) (\(\dfrac{1}{1}\) - \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) - \(\dfrac{1}{9}\) + \(\dfrac{1}{9}\) - \(\dfrac{1}{13}\) + \(\dfrac{1}{13}\) - \(\dfrac{1}{17}\)) = 16
\(x\) \(\times\) ( \(\dfrac{1}{1}\) - \(\dfrac{1}{17}\)) = 16
\(x\) \(\times\) \(\dfrac{16}{17}\) = 16
\(x\) = 16 : \(\dfrac{16}{17}\)
\(x\) = 17
11 x (X-6)=4 x X +11
=> 11 x X - 11 x 6=4 x X +11
=> 11 x X - 66 = 4 x X+11
=> 11 x X - 4 x X = 11+66
=> (11-4) x X = 77
=> 7 x X=77
=> X=77:7
=> X=11
Ta có :
11 x ( X - 6 ) = ( 4 x X ) + 11
11X - 66 = 4X + 11
11X - 4X = 11 + 66
( 11 - 4 ) X = 77
7 X = 77
X = 77 : 7
X = 11
Vậy X = 11
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