题目内容
x2-y2=25,则(x-y)2(x+y)2=( )
2已知x2+y2=25,x+y=7,且x>y,则x-y=________.
已知x2+y2=25,x+y=7,且x>y,则x-y的值为( )
已知x2+y2=25,x+y=7,且x>y,则x-y的值等于________.