(1)计算: | 1 - 3 | + ( 2022 ﹣ π ) 0 + ( - 1 2 ) ﹣ 2 ﹣ tan 60 ° ;
(2)解不等式组: 2 x - 5 < 0 ,① 1 - 2 x - 4 3 ≤ 5 - x 2 . ②
计算: (1)(2)
计算: (1);(2); (3); (4); (5);(6).
计算: (1);(2).
计算: (1);(2)(-6)×5×; (3)(-4)×7×(-1)×(-0.25);(4)