разложите на множители:
a^4+ax^3-a^3x-x^4
a⁴+ax³-a³x-x⁴=a(a³+x³)-x(a³+x³)=(a-x)(a³+x³)
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a⁴+ax³-a³x-x⁴=a(a³+x³)-x(a³+x³)=(a-x)(a³+x³)