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Encontre o posto e a nulidade das matrizes abaixo (a) A=[1−135−4−47−62]A=\left[\begin{array}{rrr}1 & -1 & 3 \\ 5 & -4 & -4 \\ 7 & -6 & 2\end{array}\right]A=157−1−4−63−42 (b) A=[20−140−2000]A=\left[\begin{array}{rrr}2 & 0 & -1 \\ 4 & 0 & -2 \\ 0 & 0 & 0\end{array}\right]A=240000−1−20
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