因为△=360*360+4*1*1555200=6350400>0;设：X1,X2为方程的解；(X+X1)*（X+X2)=0X1*X2=-1555200...1X1+X2=-360...2由1,2得X1=1080,X2=-1440或X2=1080,X1=-1440x^2-360x-1555200=(x+1080)(X-1440)=0
(1)x^2-360x-1555200=0
因为△=360*360+4*1*1555200=6350400>0;设：X1,X2为方程的解；(X+X1)*（X+X2)=0X1*X2=-1555200...1X1+X2=-360...2由1,2得X1=1080,X2=-1440或X2=1080,X1=-1440x^2-360x-1555200=(x+1080)(X-1440)=0