ax^2-2axy+ay^2-2x+2y
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ax^2-2axy+ay^2-2x+2y
ax^2-2axy+ay^2-2x+2y
ax^2-2axy+ay^2-2x+2y
ax^2-2axy+ay^2-2x+2y
=a(x^2-2xy+y^2)-2(x-y )
=a(x-y)^2-2(x-y )
=(x-y)[a(x-y)-1)]
a(x-y)^2-2(x-y)=[a(x-y)-2](x-y)
ax^2-2axy+ay^2-2x+2y
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因式分解ax-ay+x^2-y^2