化简: 1 - a - 1 a + 2 ÷ a 2 - 1 a 2 + 4 a + 4 = .
(1)化简: ( a - 1 + 1 a - 3 ) ÷ a 2 - 4 a - 3 ;
(2)解不等式: x + 1 3 - 1 < x - 1 4 .
化简 x x 2 + 2 x + 1 ÷ 1 - 1 x + 1 的结果是( )
A. 1 x + 1 B. x + 1 x C. x + 1 D. x ﹣ 1
计算: ( 2 a + 1 + a + 2 a 2 - 1 ) ÷ a a - 1 .
化简: a 2 - 1 a 2 ÷ 1 a - 1 = .
化简: a a - 2 - 4 a 2 - 2 a ÷ a + 2 a .
化简: ( x x - 3 + 2 3 - x ) ⋅ x - 3 x - 2 = .
计算 x 2 + 4 x + 4 x + 2 ÷ x 2 + 2 x x - 2 - 1 .
计算 ( a - 1 + 1 a + 1 ) ÷ a 2 + 2 a a + 1 .
计算:
(1) ( x + y ) 2 + x ( x - 2 y ) ;
(2) ( 1 - m m + 3 ) ÷ m 2 - 9 m 2 + 6 m + 9 .
(1)计算: ( π - 3 ) 0 - 12 + 4 sin 60 ° - ( 1 2 ) - 1 ;
(2)化简: ( 2 a - 1 + 1 ) ÷ a 2 + a a 2 - 2 a + 1 .
化简: a + 2 a 2 − 4 + a 2 − 3 a + 2 a 2 − 2 a + 1 ÷ a − 2 a − 1
(1) ( x + y ) 2 + y ( 3 x ﹣ y ) ;
(2) ( 4 - a 2 a - 1 + a ) ÷ a 2 - 16 a - 1 ;
化简: 1 a - 1 - 1 a 2 + a ÷ a 2 - 1 a 2 + 2 a + 1
化简: ( a 2 a − 3 + 9 3 − a ) ÷ a + 3 a = .