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1,cho a,b,c la cac so duong tuy y.CMR: (a+b-c)^2(b+c-a)^2(c+a-b)^2>=(a^2+b^2-c^2)(b^2+c^2-a^2)(c^2+a^2-b^2)
2,cho x,y thoa man dieu kien x+y+xy=8.Tim gia tri nho nhat cua bieu thuc P=x^2+y^2
3,ho a>=10,b>=100 va c>=1000.Tim gia tri nho nhat cua a+1/a+b+1/b+c+1/c
2,cho x,y thoa man dieu kien x+y+xy=8.Tim gia tri nho nhat cua bieu thuc P=x^2+y^2
3,ho a>=10,b>=100 va c>=1000.Tim gia tri nho nhat cua a+1/a+b+1/b+c+1/c
