a=根号2+1,b=根号2-1ab=1根号ab*(根号b分之a-根号a分之b)=根号b分之a-根号a分之b=(a-b)/根号ab=a-b=根号2+1-(根号2-1)=2
ab=(√2)²-1²=1√(a/b)-√(b/a)=√a/√b-√b/√a=(a-b)/√ab=(√2+1-√2+1)/√1=2所以原式=1×2=2
