
49期放課後学習数学第2回
Authored by 櫻田稔 櫻田稔
Mathematics
10th Grade
Used 10+ times

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8 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
必要
十分
必要十分
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
必要
十分
必要十分
Answer explanation
「xy>0」はxとyが共に正であることを示すため、x>0かつy>0であるための必要条件です。十分条件ではなく、必要条件が正しい選択です。
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
次の空欄に入る最も適する言葉を選べ。
「四角形ABCDが長方形であることは,四角形ABCDが平行四辺形であるための( )条件である。」
必要
十分
必要十分
Answer explanation
四角形ABCDが長方形である場合、必ず平行四辺形の条件を満たします。したがって、長方形であることは平行四辺形であるための十分条件です。必要条件ではありません。
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
必要
十分
必要十分
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Answer explanation
命題「x^2=1⇒x=-1」の逆は「x=-1⇒x^2=1」です。逆命題は元の命題の結論と仮定を入れ替えたもので、正しい選択肢です。他の選択肢は逆命題ではありません。
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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