(1) If, then; (2) from the available, you can get the denominator, and then according to the formula of complete square, finally combined with A > 0, B > 0, A+B > 0, AB > 0, you can get the conclusion.

Examination analysis: (1) According to the language in the examination, the results can be directly obtained;

(2) from the available, you can get the denominator, and then according to the formula of complete square, finally combined with A > 0, B > 0, A+B > 0, AB > 0, you can get the conclusion.

(1) If, then;

(2)∵

∴

∴

∴

∫a > 0，b>0，a+b>0，ab>0，

∴ .

Comments: The key to solve this problem is to read the meaning of the question and find the equivalence relationship and the inequality relationship according to the key descriptors.