Question

Rút gọn:

x^n-1(x+y) - y (x^n-1 + y^n-1)

Answer 1

\(x^{n-1}\cdot\left(x+y\right)-y\left(x^{n-1}+y^{n-1}\right)\)

\(=x^{n-1}\cdot x+y\cdot x^{n-1}-y\cdot x^{n-1}-y\cdot y^{n-1}\)

\(=x^n+yx^{n-1}-yx^{n-1}-y^n\)

\(=x^n-y^n\)

Answer 2

Tham khảo:

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