Question

1、式子根号a/a-3=根号a/根号a-3成立的条件是_______.

Answer 1

1、成立的条件是a>=3

2、若a>0 根号(b/a^2)=根号(b/a),和题设不符；故aa>0,则上式=[根号下(b^2-a^2)]/ab

4、根号下(0.09×121/0.36×100)=根号下(0.09×121)/根号下(0.36×100)

=(0.3×11)/(0.6×10)=11/20

5、由于-y/x^2>=0,而x^2>=0,故y