(х+у) -(х³+у³) = (х+у) - (х+у)(х²-ху+у²) = (х+у)(1-х²+ху-у²) вроде так
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(х+у) -(х³+у³) = (х+у) - (х+у)(х²-ху+у²) = (х+у)(1-х²+ху-у²) вроде так