4(x+y)^2-4(x^2-y^2)+(x-y)^2因式分解
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4(x+y)^2-4(x^2-y^2)+(x-y)^2因式分解
4(x+y)^2-4(x^2-y^2)+(x-y)^2因式分解
4(x+y)^2-4(x^2-y^2)+(x-y)^2因式分解
4(x+y)^2-4(x^2-y^2)+(x-y)^2
=4x^2+8xy+4y^2-4x^2+4y^2+x^2-2xy+y^2
=x^2+6xy+9y^2
=(x+3y)^2