若m-2n+3=0,则m2-4mn+4n2=若m-2n+3=0,则m²-4mn+4n²=帮帮我写不出啊若m-2n+3=0,则m²-4mn+4n²=

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若m-2n+3=0,则m2-4mn+4n2=若m-2n+3=0,则m²-4mn+4n²=帮帮我写不出啊若m-2n+3=0,则m²-4mn+4n²=

若m-2n+3=0,则m2-4mn+4n2=若m-2n+3=0,则m²-4mn+4n²=帮帮我写不出啊若m-2n+3=0,则m²-4mn+4n²=
若m-2n+3=0,则m2-4mn+4n2=
若m-2n+3=0,则m²-4mn+4n²=帮帮我写不出啊
若m-2n+3=0,则m²-4mn+4n²=

若m-2n+3=0,则m2-4mn+4n2=若m-2n+3=0,则m²-4mn+4n²=帮帮我写不出啊若m-2n+3=0,则m²-4mn+4n²=
m²-4mn+4n²=(m-2n)²=(-3)²=9