• Matéria: Matemática
  • Autor: brendaewelly56
  • Perguntado 5 anos atrás

resolva o sistema usando a regra de cramer...
x+3y-z=0
2x+y+z=1
3x-y+z=3

Respostas

respondido por: DoutorBrainly
6

  • \begin{cases}x+3y-z=0\\2x+y+z=1\\3x-y+z=3\\\end{cases}

\begin{bmatrix}</p><p>1&amp;3&amp;-1\\</p><p>2&amp;1&amp;1\\</p><p>3&amp;-1&amp;1\end{bmatrix}

  • \small{d=1+9+2-(-3-1+6)}

  • \small{d=10+2-(-4+6)}

  • \small{d=12-(2)}

  • \small{d=12-2}

  • \small{d=10}

\begin{bmatrix}</p><p>0&amp;3&amp;-1\\</p><p>1&amp;1&amp;1\\</p><p>3&amp;-1&amp;1\end{bmatrix}

  • \small{dx=0+9+1-(-3+0+3)}

  • \small{dx=10-(0+0)}

  • \small{dx=10}

\begin{bmatrix}</p><p>1&amp;0&amp;-1\\</p><p>2&amp;1&amp;1\\</p><p>3&amp;3&amp;1\end{bmatrix}

  • \small{dy=1+0-6-(-3+3+0)}

  • \small{dy=1-6-(0+0)}

  • \small{dy=-5}

\begin{bmatrix}</p><p>1&amp;1&amp;0\\</p><p>2&amp;1&amp;1\\</p><p>3&amp;-1&amp;-1\end{bmatrix}

  • \small{dz=3+9+0-(0-1+18)}

  • \small{dz=12-(17)}

  • \small{dz=12-17}

  • \small{dz=-5}

☑️ Encontrar as incógnitas

  • \small{x=\dfrac{dx}{d}}

  • \small{x=\dfrac{10}{10}}

  • \small{x=\:1}

  • \small{y=\dfrac{dy}{d}}

  • \small{y=\dfrac{-5}{10}}

  • \small{y=-\dfrac{1}{2}}

  • \small{z=\dfrac{dz}{d}}

  • \small{z=\dfrac{-5}{10}}

  • \small{z=\dfrac{-1}{2}}

☑️ Solução=(1 ; -1/2 ; -1/2)

Anexos:
Perguntas similares