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x+1 - II liczba
x+2 - III liczba
x^2+(x+1)^2+(x+2)^2=302
x^2+x^2+2x+1+x^2+4x+4=302
3x^2+6x+5-302=0
3x^2+6x-297=0
delta=36+4*3*297=36+3564=3600
pier(delta)=60
x1=-6-60/6 - nie spełnia warunków zadania <0
x2=-6+60/6=54/6=9
odp. 9, 10,11
x²+x²+2x+1+x²+4x+4=302
3x²+6x+5=302
3x²+6x-297=0
Δ=36+4*3*297=3600
x₁=(-6-60)/6=-11 sprzeczne
x₂=(-6+60)/6=9
te liczby to 9,10,11