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Решите задачу:

$\frac{x^{n+m}}{x^{n+1}x^{m-1}}=\frac{x^{n+m}}{x^{n+1+m-1}}=\frac{x^{n+m}}{x^{n+m}}=1$

$\frac{a^2a^{n+1}a^3}{a^{n-1}a^6}=\frac{a^{2+n+1+3}}{a^{n-1+6}}=\frac{a^{n+6}}{a^{n+5}}=a^{n+6-n-5}=a$

$\frac{x^{2n}x^{n+3}}{x^{3n}}=\frac{x^{2n+n+3}}{x^{3n}}=\frac{x^{3n+3}}{x^{3n}}=x^{3n+3-3n}=x^3$

$\frac{d^{n+1}}{d^{n-5}d^{7}}=\frac{d^{n+1}}{d^{n-5+7}}=\frac{d^{n+1}}{d^{n+2}}=d^{n+1-n-2}=d^{-1}= \frac{1}{d}$