Mathematics
Junior High
Resolved

多項式の展開で
①(2x +1)(x -3)
②(3x +5y)(2x -3y)
の解き方がわかりません。ちなみに答えは①2x二乗−5x−3
                   ②6x二乗+xy−15y二乗  です。
よろしくお願いします。

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