2x^2+4x=0 /:2
x^2+2x=0
По теореме Виета:
x1+x2=-2
x1*x2=0
x1=0
x2=-2
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2x^2+4x=0 /:2
x^2+2x=0
По теореме Виета:
x1+x2=-2
x1*x2=0
x1=0
x2=-2