Вот а-b (2-(-1);-3-2)=(3;-5)
a+b (2+(-1);-3+2)=(1;-1)
|a+b| √1^2+(-1)^2=√1+1=√2=2
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Вот а-b (2-(-1);-3-2)=(3;-5)
a+b (2+(-1);-3+2)=(1;-1)
|a+b| √1^2+(-1)^2=√1+1=√2=2