B
bichngoc9b


1, chung minh: (a+b)^2(b+c)^2\geq4abc(a+b+c)
2, cho a, b, c la cac so thuc thoa man dieu kien (a+c)(a+b+c)<0
chung minh bat dang thuc
b-c)^2>4a(a+b+c)
3, giai phuong trinh trong tap so tu nhien:
3(x^2+xy+y^2)=x+8y
co gang giup minh nha, minh cam on nhieu
2, cho a, b, c la cac so thuc thoa man dieu kien (a+c)(a+b+c)<0
chung minh bat dang thuc
3, giai phuong trinh trong tap so tu nhien:
3(x^2+xy+y^2)=x+8y
co gang giup minh nha, minh cam on nhieu
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