Mathematics
Senior High
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（2）教えて欲しいです🙏
6
(1)
次の命題の逆・裏・対偶をつくり,その真偽を調べよ。
x2-x-2=0 ならば x=2またはx=-1である。
(2) ab=0 ならば a+b=0
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ありがとうございます‼️