计算:(每小题3分,共9分)(1) (2)(3)
先化简,再求值: x 2 x + 1 - x + 1 ,其中 x= 12 ﹣( 1 4 ) ﹣ 1﹣|1﹣ 3 |.
(1)计算: ( - 1 ) 2018 - 2 cos 30 ∘ - 1 2 - 2 - | 3 - 2 | + ( 2018 - π ) 0
(2)先化简,再求值: x 2 - 2 x + 1 x 2 - x - 4 - x 2 x 2 + 2 x ÷ x - 4 x ,且 x为满足﹣3< x<2的整数.
(1)计算: | - 2 | - 2016 0 + 1 2 - 2
(2)解不等式组: 2 3 x > 5 - x x + 2 > 2 x - 3 .
先化简,再求值: 3 x + 1 - x + 1 ÷ x 2 + 4 x + 4 x + 1 ,其中 x = 2 - 2 .
计算: - | - 1 | + 12 ⋅ cos 30 ∘ - - 1 2 - 2 + ( π - 3 . 14 ) .