х - 1 1 - х х - 1 х - 1 ------- - ----------------- = ------------ + -------------------- = х + 2 х² + 3х + 2 х + 2 (х + 2)(х + 1) (х - 1)(х + 1) + х - 1 (х - 1)(х + 1 + 1) ------------------------------- = ------------------------- = (х + 2)(х + 1) (х + 2)(х + 1) х - 1 ------------ х + 1 ........................................................................................................