a-b=√3+√2,b-c=√3-√2相加a-c=2√3原式=(2a²+2b²+2c²-2ab-2bc-2ac)/2=[(a²-2ab+b²)+(b²-2bc+c²)+(c²-2ac+a²)]/2=[(a-b)²+(b-c)²+(a-c)²]/2=(5+2√6...