已知x-y=4,x-3y=1,则x2-4xy+3y2的值为_.
问题描述:
已知x-y=4,x-3y=1,则x2-4xy+3y2的值为______.
答
∵x-y=4,x-3y=1,
∴x2-4xy+3y2=(x-y)(x-3y)=4.
故答案为:4