已知:x+y=6,xy=-3,则 xyy+yxx=
问题描述:
已知:x+y=6,xy=-3,则 xyy+yxx=
答
xyy+yxx=xy(x+y)=3*6=18
答
xyy+yxx=xy*(x+y)=-3*6=-18
答
将xy提取公因式变成:
xy(x+y)=-3*6=-18
答
xyy+yxx=xy(x+y)=-3*6=-18