计算:(1)(﹣4)﹣(﹣1)+(﹣6)÷2.(2)27÷(﹣3)2﹣(﹣)×(﹣8)
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 ) .
计算: | - 2 | + 9 × ∣ 1 2 - 1 - 4 × 1 2 - ( π - 1 ) 0 .
先化简,再求值: a 2 - 3 a a 2 + a ÷ a - 3 a 2 - 1 ⋅ a + 1 a - 1 ,其中a=2016.
计算: ( - 1 ) 2016 + 2 sin 60 ∘ - | - 3 | + π 0 .