1:x^2-3x=2x^2-3x-2=0根据求根公式[x-(3+根号17)/2][x-(3-根号17)/2]=02:x^2-5x+y^2-5y根据求根公式={x+y-[5+根号(25+8xy)]/2}{x+y-[5-根号(25+8xy)]/2}=0我晕
1:(x-2)*(x-1)=42: