若m-2n+3=0,则m2-4mn+4n2的值是_.
问题描述:
若m-2n+3=0,则m2-4mn+4n2的值是______.
答
∵m-2n+3=0,即m-2n=-3,
∴原式=(m-2n)2=9.
故答案为:9