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a=1
b=-2
c=1
Δ=b²-4ac⇒Δ=(-2)²-4×1×1⇒Δ=4-4⇒Δ=0⇒√Δ=√0⇒Δ=0
x1x2=-b+-√Δ/2a
x1x2=2+-0/2=2/2⇒x1x2=1
sucees