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b) 8x² + 68x+ 52
c) 3x+x²-1 x≠0 ∧ x≠-1
d) 10x-15+x₂ x>1,5
e) 5x²-7x-6 x≠2 ∧ x≠0
i) 5x²+9x-2 x≠-2
k) 5x²+11x - 36 x≠-4