calcule o determinante de cada matriz
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a)
det A = 2(1 • (–1) – (–1) • 2) – (3 • 2 – 1 • 1)
det A = 2(–1 + 2) – (6 – 1)
det A = 2 – 5 = –3
b)
det B = 1 • (–2) – (–1) • 2 = –2 + 2 = 0
c)
det C = 3(4 • 1 – (–1/2) • 2) + (–2 • 2 – 4 • 5)
det C = 3(4 + 1) + (–4 – 20)
det C = 15 – 24 = –9
d)
det D = 5 • 2/5 – 1/3 • (–9) = 2 + 3 = 5
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