计算:(a>0).
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 .
解不等式组: 4 x - 5 > x + 1 3 x - 4 2 < x .
计算: 2 sin 60 ° + 12 + | - 5 | - ( π + 2 ) 0 .