A:x>0
B:x≥﹣2
C:x≥2
D:x≤2
(1)4﹣(﹣2)﹣2﹣32÷(3.14﹣π)0
(2)(318)12×(825)11×(一2)3
(3)5a(a2﹣3a+1)﹣a2(1﹣a)
(4)(﹣a)3•(﹣2ab2)3﹣4ab2(a5b4﹣5)