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4x²-3x-17=4*(-0,2)²-3*(-0,2)-17=0,16+0,6-17=-16,24
b)=3x²y-xy-x²y+xy²-xy=2x²y+xy²-2xy
2*(-1)²*1/5+(-1)*(1/5)²-2*(-1)*1/5=2/5-1/25+2/5=10/25-1/25+10/25=19/25