(1)计算 ( 2017 − π ) 0 − ( 1 4 ) − 1 + | − 2 |
(2)化简 ( 1 − 1 a − 1 ) ÷ ( a 2 − 4 a + 4 a 2 − a ) .
化简: ( a + 2 a 2 - 2 a - a - 1 a 2 - 4 a + 4 ) ÷ a - 4 a .
计算: 2 cos 45 ° + ( 1 3 ) - 1 - | - 3 | .
先化简,再求值: x x - 4 ⋅ ( x + 2 x 2 - 2 x - x - 1 x 2 - 4 x + 4 ) ,其中 x = 3 - 2 .
解不等式组: x ⩾ 3 - 2 x① x - 1 2 - x - 3 6 < 1 ② .
计算: 12 + | 3 - 3 | - ( 1 3 ) - 1 .