计算: 2017 0 − | 1 − 2 | + ( 1 3 ) − 1 + 2 cos 45 ° .
解方程: x + 3 x - 3 - 2 x + 3 = 1 .
计算: ( - 2 ) × 6 + | 3 - 2 | - ( 1 2 ) - 1 .
解分式方程: 2 x - 1 x + 2 = 2 - 3 x - 2 .
计算: 18 - ( π - 5 ) 0 + | 2 2 - 3 | .
化简: ( x - 5 + 16 x + 3 ) ÷ x - 1 x 2 - 9 .