计算:(1)sin30°-cos45°+tan260°(2)
计算: 12 + ( π - 3 ) 0 - 2 cos 30 ∘ .
解不等式组: 2 x - 6 < 0 ⋯ ① 1 - x < 0 ⋯ ② .
计算: ( 2 π ) 0 + | - 6 | - 8 3 .
先化简再求值: x + 1 - 3 x - 1 ⋅ x - 1 x - 2 ,其中 x = 2 + 2 .
计算: 12 + | 3 - 3 | - 2 sin 60 ∘ - ( 3 ) 2 + 2016 0 .