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9*32=x(34-x)
288=34x-x²
x²- 34x+288 = 0
Δ=(-34)²-4*1*288=1156-1152=4
√Δ=2
x₁=34-2/2=16 ∨ x₂=34+2/2=18
Odp. Wyrazy środkowe to 16 i 18.