\(\dfrac{x}{9}=\dfrac{3}{y}+\dfrac{1}{18}\left(y\ne0\right)\)

\(\Rightarrow\dfrac{2xy}{18y}=\dfrac{54}{18y}+\dfrac{y}{18y}\)

\(\Rightarrow2xy=54+y\)

\(\Rightarrow2xy-y=54\)

\(\Rightarrow xy-\dfrac{y}{2}=27\)

\(\Rightarrow y\left(x-\dfrac{1}{2}\right)=27\)

\(\Rightarrow\left(x-\dfrac{1}{2}\right);y\in\left\{1;3;9;27\right\}\)

\(\Rightarrow\left(x;\right)y\in\left\{\left(\dfrac{1}{2};27\right);\left(\dfrac{5}{2};9\right);\left(\dfrac{17}{2};3\right);\left(\dfrac{53}{2};1\right)\right\}\)

\(\Rightarrow\left(x;y\right)\in\varnothing\left(x;y\inℕ\right)\)

      Đổi 6 tấn = 6000 (kg)

Sau hai buổi bán trong kho còn lại số kg thóc là :

      6000 - 3250 - 2500 = 250 (kg)

              Đ/s...

\(a,\left(2a-3\right)\left(a+1\right)+\left(a^2+6a+9\right):\left(a+3\right)\\ =2a^2-a-3+\left(a+3\right)^2:\left(a+3\right)\\ =2a^2-a-3+a+3\\ =2a^2\\ b,\left(3x-5y\right)\left(-xy\right)^2-3x^2y^2+4x^2y^3\\ =3x^3y^2-5x^2y^3-3x^2y^2+4x^2y^3\\ =3x^3y^2-3x^2y^2-x^2y^3\\ c,x\left(x-2\right)^2-\left(x+2\right)\left(x^2-2x+4\right)+4x^2\\ =x^3-4x^2+4x-x^3-8+4x^2\\ =4x-8\)

Để olm.vn giúp em nhá

C = \(\dfrac{1}{1.4}\) + \(\dfrac{1}{4.7}\) + \(\dfrac{1}{7.11}\)+...+ \(\dfrac{1}{994.997}\) + \(\dfrac{1}{997.1000}\)

C = \(\dfrac{1}{3}\).( \(\dfrac{3}{1.4}\) + \(\dfrac{3}{4.7}\) + \(\dfrac{3}{7.11}\)+...+ \(\dfrac{3}{994.997}\)+ \(\dfrac{3}{997.1000}\))

C = \(\dfrac{1}{3}\).( \(\dfrac{1}{1}\) - \(\dfrac{1}{4}\) + \(\dfrac{1}{4}\) - \(\dfrac{1}{7}\) + \(\dfrac{1}{7}\)-\(\dfrac{1}{11}\)+...+ \(\dfrac{1}{994}\)- \(\dfrac{1}{997}\)+ \(\dfrac{1}{997}\) - \(\dfrac{1}{1000}\))

C = \(\dfrac{1}{3}\).( \(\dfrac{1}{1}\) - \(\dfrac{1}{1000}\))

C = \(\dfrac{1}{3}\). \(\dfrac{999}{1000}\)

C = \(\dfrac{333}{1000}\)

Dấu chấm là dấu nhân nhé

\(3^{8x+4}=81^{x+3}\)

\(3^{8x+4}=\left(3^4\right)^{x+3}\)

\(3^{8x+4}=3^{4x+12}\)

\(\Rightarrow8x+4=4x+12\)

\(\Rightarrow8x-4x=12-4\)

\(\Rightarrow4x=8\Rightarrow x=2\)

  3^{8.x + 4} = 81^{x + 3}

  3^{8.x + 4} = (3⁴)^{x + 3}

  3^{8.x + 4} = 3^{4.x + 12}

  8.x + 4 = 4.x + 12

8.x - 4.x = 12 - 4

        4.x = 8

           x = 8 : 4

           x = 2

\(2^x=2+2+2^2+...+2^{30}\)

\(\Rightarrow2^x=1+\left(1+2+2^2+...+2^{30}\right)\)

\(\Rightarrow2^x=1+\dfrac{2^{30+1}-1}{2-1}\)

\(\Rightarrow2^x=1+2^{31}-1\)

\(\Rightarrow2^x=2^{31}\)

\(\Rightarrow x=31\)

`#040911`

`a)`

`(2x - 1)^2 - (2x + 5)(2x + 1) = 10`

`\Leftrightarrow 4x^2 - 4x + 1 - (4x^2 + 12x + 5) = 10`

`\Leftrightarrow 4x^2 - 4x + 1 - 4x^2 - 12x - 5 = 10`

`\Leftrightarrow (4x^2 - 4x^2) - (4x + 12x) + (1 - 5) = 10`

`\Leftrightarrow -16x - 4 = 10`

`\Leftrightarrow -16x = 10 + 4`

`\Leftrightarrow -16x = 14`

`\Leftrightarrow x = \dfrac{-7}{8}`

Vậy, `x= \dfrac{-7}{8}`

`b)`

`9^2(x - 1) + 25(1 - x) = 0`

`\Leftrightarrow 9^2(x - 1) - 25(x - 1) = 0`

`\Leftrightarrow (x - 1)(9^2 - 25) = 0`

`\Leftrightarrow`\(\left[{}\begin{matrix}x-1=0\\9^2-5^2=0\end{matrix}\right.\)

`\Leftrightarrow`\(\left[{}\begin{matrix}x=1\\\left(9-5\right)\left(9+5\right)=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1\\4\cdot14=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=1\\56=0\left(\text{vô lý}\right)\end{matrix}\right.\\ \text{Vậy, x = 1}\)

`c)`

\(x^2+3x-4=0\)

`\Leftrightarrow x^2 + 4x - x - 4 = 0`

`\Leftrightarrow (x^2 - x) + (4x - 4) = 0`

`\Leftrightarrow x(x - 1) + 4(x - 1) = 0`

`\Leftrightarrow (x + 4)(x - 1) = 0`

\(\Leftrightarrow\left[{}\begin{matrix}x+4=0\\x-1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-4\\x=1\end{matrix}\right.\\ \text{ Vậy, }x\in\left(-4;1\right)\)

  2^x + 2^{x + 1} = 96

  2^x + 2^x . 2 = 96

 2^x . (1 + 2) = 96

         2^x . 3 = 96

              2^x = 96 : 3

              2^x = 32

              2^x = 2⁵

                x = 5

2 - \(x\) + \(\dfrac{3}{4}\) = \(\dfrac{55}{63}\) : \(\dfrac{11}{21}\)

2 - \(x\) + \(\dfrac{3}{4}\) = \(\dfrac{55}{63}\) x \(\dfrac{21}{11}\)

2 - \(x\) + \(\dfrac{3}{4}\) = \(\dfrac{5}{3}\)

       2 - \(x\) =  \(\dfrac{5}{3}\) - \(\dfrac{3}{4}\)

       2 - \(x\) = \(\dfrac{20}{12}\) - \(\dfrac{9}{12}\)

       2 - \(x\) = \(\dfrac{11}{12}\)

            \(x\) = 2 - \(\dfrac{11}{12}\)

            \(x\) = \(\dfrac{24}{12}\) - \(\dfrac{11}{12}\)

            x = \(\dfrac{13}{12}\)