Odpowiedzi

2009-11-16T17:53:32+01:00
A)=7x²-21x-14-(3x²-18x+3)=7x²-21x-14-3x²+18x-3=4x²-3x-17
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