(x-y)^6 ÷(y-x)^3 ÷(x-y)
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(x-y)的6次方除以(y-x)的3次方除以(x-y)
=(x-y)的6次方/[-(x-y)]的3次方/(x-y),
=-(x-y)的6次方/(x-y)的3次方/(x-y),
=-(x-y)的(6次方-3次方)/(x-y),
=-(x-y)的3次方/(x-y),
=-(x-y)的(3次方-1次方),
=-(x-y)的2次方,
=-(x-y)²
=(x-y)的6次方/[-(x-y)]的3次方/(x-y),
=-(x-y)的6次方/(x-y)的3次方/(x-y),
=-(x-y)的(6次方-3次方)/(x-y),
=-(x-y)的3次方/(x-y),
=-(x-y)的(3次方-1次方),
=-(x-y)的2次方,
=-(x-y)²
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