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(х–3)^2–3(2х^2+5)+4(1,25х^2–1) 2 ---------------------------------------------- = --- 12 3 х^2–6х+9–6х^2–15+5х^2–4 2 ----------------------------------------- = ---- 12 3 3•(–6х–10) = 24 –18х–30 = 24 –18х = 54 х= –3