(1)计算: 12 - 8 3 + | 3 - 2 | ;
(2)化简: ( a + 3 ) ( a - 2 ) - a ( a - 1 ) .
(每小题4分,共8分)(1) (2)
(本小题4分)化简:.
计算(每小题4分,共8分): (1) (2)
(每小题6分,共12分)解不等式组: (1). (2)
(每小题6分,共12分)解方程组: (1) (2)