问题
填空题
已知x2-7xy+12y2=0,那么x与y的关系是______.
答案
∵12y2=(-3y)(-4y),-7y=(-3y)+(-4y),
∴x2-7xy+12y2=(x-3y)(x-4y)=0
∴x-3y=0,x-4y=0
∴x=3y或x=4y.
已知x2-7xy+12y2=0,那么x与y的关系是______.
∵12y2=(-3y)(-4y),-7y=(-3y)+(-4y),
∴x2-7xy+12y2=(x-3y)(x-4y)=0
∴x-3y=0,x-4y=0
∴x=3y或x=4y.