a>1,-1

a>1,-1

(1) 1 / a - (- B / a) = (1 + b) / A; ∵ a > 1, - 10; ∵ 1 / a - (- B / a) = (1 + b) / a > 0, so 1 / a > - B / A
(2);∵a>1,-1