计算:
解方程: 5 x - 8 x 2 - 9 - 1 = 3 - x x + 3 .
计算: - 2 × ( 3 ) 2 + | 5 - 3 | - ( - 65 ) 0 .
化简: ( a + 1 a - 1 - a a + 1 ) ÷ 3 a + 1 a 2 + a .
计算: ( - 3 ) × ( - 6 ) + | 2 - 1 | + ( 5 - 2 π ) 0
解方程: x + 3 x - 3 - 2 x + 3 = 1 .