已知a=½;m+1,b=½;m+2,c=½;m+3求a²;+2ab+b²;-2ac+c²;-2bc的值

已知a=½;m+1,b=½;m+2,c=½;m+3求a²;+2ab+b²;-2ac+c²;-2bc的值

a=½;m+1,b=½;m+2,c=½;m+3
∴a²;+2ab+b²;-2ac+c²;-2bc
=(a+b-c)²;
=(1/2m+1+1/2m+2-1/2m-3)²;
=(1/2m)²;
=m²;/4