(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:
计算:.
(1)计算(-10)3+ ;
计算(每题5分,共10分)(1) (2)(-5)2×-300÷5
计算: (2)