Mathematics
Senior High
かっこ5番最後の解説で(x-3x+1)の1はどこから来ましたか
3y)
(5) (5x)=(x³-27y³)+(x²+3xy+9y²)
= (x³-(3y)³}+(x²+3xy+9y²)
=(x-3y)
{x²+x-3y+(3y)²)+(x²+3xy+9y²)
=(x-3y) (x²+3xy+9y²)+(x²+3xy+9y²)
=(x-3y+1)(x²+3xy+9y²)
(5+3)
20 (1) 125a²+646³ (+
(3) x²+2x²-9x-18
(5) x²+x²+3xy-27y³ +9y²
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