A:remaining to be done, stay
B:remained to be done, stayed
C:remaining to do, to stay
D:remained to do, staying
禁毒应该以预防为主,综合治理。( )
计算:
(1)﹣12﹣(1﹣0.5)×13×36
(2)(8a2b﹣5ab2)﹣2(3a2b﹣4ab2)
(3)9(3﹣x)2=25
(4)2x-y=53x+4y=2.