(１)(Ｘ＋Ｙ)²＋9(Ｘ＋Ｙ)＋14
＝Ａ²＋9Ａ＋14 ←カッコ内をＡに置き換える
＝(Ａ＋2)(Ａ＋７)
＝(Ｘ＋Ｙ＋2)(Ｘ＋Ｙ＋７)
（ 2 ）は１と同じ容量でやります！
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(１)(Ｘ＋Ｙ)²＋9(Ｘ＋Ｙ)＋14
＝Ａ²＋9Ａ＋14 ←カッコ内をＡに置き換える
＝(Ａ＋2)(Ａ＋７)
＝(Ｘ＋Ｙ＋2)(Ｘ＋Ｙ＋７)
（ 2 ）は１と同じ容量でやります！
Users viewing this question
are also looking at these questions 😉
