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6x²-2x=0
2x(3x-1)=0
2x=0 lub 3x-1=0
x=0∈<-1;2> lub x=1/3∈<-1;2>
toz f(0)=0
f(1/3)=2*1/27-1/9=2/27-1/9=2/27-3/27=-1/27
f(-1)=2*(-1)³-(-1)²=-2-1=-3
f(2)=2*2³-2²=16-4=12
fnajmniejsza=-3
fnajwieksza=12