11化简求值11化简求值
11化简求值原式=(b+a)(b-a)/[a(a-b)]×a/(a+b)²×(a+b)/(ab)=-1/ab当a=√2+√3,b=√2-√3时原式=-1/(√2+√3)(√2-√3)=-1÷(2-3)=1