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⎡⎢⎣1 0 0 02 1 0 0−0.5 −0.5 1 01.5 0.16 l 43 1⎤⎥⎦⎡⎤ ⎡2 1 3 4⎢ 0 −3 −4 −7⎥⎣ 0 0 u 33 u 34⎦ = ⎢⎣0 0 0 u 442 1 3 44 −1 2 1−1 1 8 33 1 4 1⎤⎥⎦• V o blocco di eq.( III a riga di L) ·U = (III a riga di A),l 31 · u 1j + l 32 · u 2j + u 3j = a 3jper j = 3, . . . , n[−0.5 − 0.5 1 0] · U = [−1 1 8 3]−1.5 + 2 + u 33 = 8, −2 + 3.5 + u 34 = 3⇒ u 33 = 7.5, u 34 = 1.5