Mathematics, 23.07.2021 14:00, dbanks701

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"

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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...

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