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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"
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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"

User Robin Vinzenz
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Answer:

Which language is this ?????

User Huygn
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