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3x²-x=0
x(3x-1)=0
x1=0 x2=1/3
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4x²+6x+2=-x+1
4x²+7x+1=0
Δ=49-16=33
√Δ=√33≈5,74
x1=(-7+√33)/8=-0,156
x1=(-7-√33)/8=-1.593