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a)1\6t²+1\3k²t+1\3tk²-k²t+1\2t²-1\6tk²= 1/6t²+ 2/6k²t + 2/6tk² - k²t + 3/6t² - 1/6tk²= 4/6 t² - 3/6 tk²
b)u²v²+1\4uv-1\7u²v²-uv-1\2uv+u²v²=1⁶/₇u²v² - 1¼uv
zad2
5x-2y-3x+3y-2= 5*1,5 - 2*(-2,5) -3*(1,5) +3*(-2,5) -2= 7,5 + 5 - 4,5 - 7,5 - 2= -1,5