1.若a+b=1,求证√（a+1/2）+√(b+1/2)≤22.已知x,y,z不全为零,求证:√(x^2+xy+y^2)+√(y^2+yz+z^2)+√(z^2+zx+x^2)＞3/2(x+y+z)

Question

1.若a+b=1,求证√（a+1/2）+√(b+1/2)≤2 2.已知x,y,z不全为零,求证:√(x^2+xy+y^2)+√(y^2+yz+z^2)+√(z^2+zx+x^2)＞3/2(x+y+z)

Answer 1

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