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1) x=0.053
2)x^2=0 x=0
3) 2x^2=48.096 x^2=24.048 x=4.9
4) x^2-8x-12.09=0 D=112.6 кореньD=10.6
x1=8+10.6/2=9/3 x2=8-10.6/2 = -1.3
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2*(-1/3)+3*(1/27)=(-2/3)+(1/9)=(-5/9)