x1+x2=3 ,x1*x2=3/21.x1^2*x2 + x1*x2^2 =x1*x2(x1 + x2) =(3/2)*3 =9/22.1/x1^2 + 1/x2^2 = (x2^2 + x1^2)/(x1^2*x2^2) =[(x1+x2)^2 - 2x1*x2]/(x1*x2)^2 =8/33.(x1+1/x2)(x2+1/x1) = x1*x2 + 1 + 1 + 1/x1*x2 = (3...