x²-y/ax-bx+ay-by=?

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x²-y/ax-bx+ay-by=?x²-y/ax-bx+ay-by=?x²-y/ax-bx+ay-by=?ax-bx+ay-by=(ax+ay)-(bx+by)=a(x

x²-y/ax-bx+ay-by=?
x²-y/ax-bx+ay-by=?

x²-y/ax-bx+ay-by=?
ax-bx+ay-by
=(ax+ay)-(bx+by)
=a(x+y)-b(x+y)
=(a-b)(x+y)
原式=（x+y）（x-y）/(a-b)(x+y)
=(x-y)/(a-b)