Question 861603
{{{abs(u)=sqrt(10^2+(-1)^2)=sqrt(101)}}}
{{{abs(v)=sqrt((-2)^2+(2)^2)=sqrt(8)=2sqrt(2)}}}
{{{abs(2u)=2abs(u)=2*sqrt(101)}}}
{{{abs((1/2)u)=(1/2)abs(u)=sqrt(101)/2}}}
u+v=(10-2,-1+2)=(8,1)
{{{abs(u+v)=sqrt(8^2+1^2)=sqrt(65)}}}
u-v=(10-(-2),-1-2)=(12,-3)
{{{abs(u-v)=sqrt(12^2+(-3)^2)=sqrt(153)}}}
{{{abs(u)-abs(v)=sqrt(101)-2sqrt(2)}}}