约分a^n+1-ab^n除以a^2n+2-a^2b^2n约分:(a^n+1)-a乘b^n除以(a^2n+2)-a^2b^2n

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约分a^n+1-ab^n除以a^2n+2-a^2b^2n约分:(a^n+1)-a乘b^n除以(a^2n+2)-a^2b^2n约分a^n+1-ab^n除以a^2n+2-a^2b^2n约分:(a^n+1)

约分a^n+1-ab^n除以a^2n+2-a^2b^2n约分:(a^n+1)-a乘b^n除以(a^2n+2)-a^2b^2n
约分a^n+1-ab^n除以a^2n+2-a^2b^2n
约分:
(a^n+1)-a乘b^n
除以(a^2n+2)-a^2b^2n

约分a^n+1-ab^n除以a^2n+2-a^2b^2n约分:(a^n+1)-a乘b^n除以(a^2n+2)-a^2b^2n
分母是平方项相减,拆成(a^n+1 +a x b^n)(a^n+1 - a x b^n),分子分母约掉相同的一项,结果是1/(a^n+1 - a x b^n)