Mathematics
Senior High
（4）の解き方を教えていただきたいです
よろしくお願いします
予習の範囲としてだされたので、おそらく高1の初めに習うのだと思います
練習 次の式を展開せよ。
13
20
(3)(x2+2x+3)(x°-2x+3)
(4) (x-y+z)(x+y-z)
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