b=1/(√2-1)=(根号2+1）/【（根号2-1）（根号2+1）】=（根号2+1）/（2-1）=根号2+1所以：a=b
√2＝a-1 带入b=1/(a-1)-1=(2-a)/(1-a)
ab=-a+b+2
a>b
