Mathematics
Senior High
大至急！
（3）解説お願いいたします。早めに回答して下さるとありがたいです！
次の式を因数分解せよ。
(1) x² + 3xy+2y² + 4x +7y+3 (
(2) 2x² + 3xy+y²+x-y-6
(3) 2x²+7xy+3y²-7x-11y+6
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