Mathematics
Senior High
３〜８までの問題の途中式と解説をお願いします！
*(3) (a²-2a+1)(a+1)
*(5) (x-1)(x³+x²+x+1)
*(7) (3+a³-2a)(3a+2-a²)
*(4) (2x-y+3z)(x+2y-z)
(6) (x²-3x²-2x+1)(x²-3)
*(8) (2x+3y)(x²-2xy-3y²)
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