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thucao.16091970
2 năm trước
1.Cho pt x^2+5x+4-9m=0.tìm các giá trị của m để Phương trình có 2 nghiệm x1,x2 thỏa mãn x1(x1^2-1)-x2(8x2^2+1)=5 2.Cho 2 số thực dương x,y thỏa x,y>3 . tìm gtnn P=21(x+1/y)+3(y+1/x)
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