Chứng minh mệnh đề sau bằng phương pháp phản chứng: " Nếu phương trình bậc hai ax2+bx+c=0 vô nghiệm thì a và c cùng dấu"

Lifeisbeautiful asked Jan 26, 2022

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Chứng minh mệnh đề sau bằng phương pháp phản chứng:

" Nếu phương trình bậc hai ax2+bx+c=0 vô nghiệm thì a và c cùng dấu"

Lifeisbeautiful asked Jan 26, 2022

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16 votes

Answer:

Which language is this ?????

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