计算:.
计算: | 3 - 1 | - 4 1 2 - 12 + ( 1 3 ) - 2 .
化简: ( a - 2 a + 2 + 8 a a 2 - 4 ) ÷ a + 2 a 2 - 2 a
计算: - 2 × - 27 3 + | 1 - 3 | - ( 1 2 ) - 2
解方程: 5 x - 8 x 2 - 9 - 1 = 3 - x x + 3 .
计算: - 2 × ( 3 ) 2 + | 5 - 3 | - ( - 65 ) 0 .