-a的3m次方除以-am次方的3次方
=（-a^3m)/(-a^3m)
=1
y的n次方的2次方÷y2次方的n-1次方
=y^2n / y^(2n-2)
=y^2
x-y的6次方乘y-x的3次方乘以x-y
=(x-y)^6 *(-(x-y))^3*(x-y)
=(x-y)^6 *(-(x-y)^3)*(x-y)
=-(x-y)^10
(x-y）的6次方除以(y-x)的3次方除以(x-y)
=(x-y)^6 /(-(x-y))^3 /(x-y)
=(x-y)^6 /(-(x-y)^3)/(x-y)
=-(x-y)^3/(x-y)
=-(x-y)^2
x的10次方除以x的5次方+（-x）9次方除以(-x的4次方)
= x^5+（-x^9）/(-x^4)
= x^5+x^5
= 2x^5
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