Question

已知a=(1,x)b=(x2+x,-x)m为常数且m≤-2

Answer 1

ab=x^2+x-x^2=x;

ab+2>m((2/ab)+1)

x+2>m((2+x)/x)

如果x+2>0;

1>m/x;

m^2-2;

如果x+2