(x+y) (x²-3xy+y²)

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(x+y)(x²-3xy+y²)(x+y)(x²-3xy+y²)(x+y)(x²-3xy+y²)(x+y)(x²-3xy+y

(x+y) (x²-3xy+y²)
(x+y) (x²-3xy+y²)

(x+y) (x²-3xy+y²)
(x+y) (x²-3xy+y²)=x (x²-3xy+y²)+y (x²-3xy+y²)
=x³-3x²y+xy²+x²y-3xy²+y³
=x³-2x²y-2xy²+y³

原式=x³-3x²y+xy²+x²y-3xy²+y³
=x³-2x²y-2xy²+y³