Question

Разложи на множители k^3−r^2k−rk^2+r^3

Answer 1

k³-r²k-rk²+r³=k³+r³-rk(r+k)= (r+k)(r²-rk+k²)-rk(r+k)=(r+k)(r²-rk+k²-rk)=(r+k)(r-k)²