ax-bx+ay-by=··········化简

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ax-bx+ay-by=··········化简ax-bx+ay-by=··········化简ax-bx+ay-by=··········化简ax-bx+ay-by=x(a-b)+y(a-b)=(a

ax-bx+ay-by=··········化简
ax-bx+ay-by=··········化简

ax-bx+ay-by=··········化简
ax-bx+ay-by
=x(a-b)+y(a-b)
=(a-b(x+y)