计算(每小题7分,共14分)(1)(2a) 3·b4÷12a3b2 (2) (3x-1)(2x+3)-6x2
化简: ( a a - 1 + 5 a + 9 a 2 - 1 ) ÷ a + 3 a - 1 .
解方程: x 2 - x - 2 = 0 .
计算: 2021 0 + 3 - 1 ⋅ 9 - 2 sin 45 ° .
先化简,再求值: x 2 + 2 x + 1 x ÷ ( x - 1 x ) ,其中 x = 2 + 1 .
化简: ( a + 2 a 2 - 2 a - a - 1 a 2 - 4 a + 4 ) ÷ a - 4 a .