一部手机现价1600元,比原价便宜了400元,便宜了百分之几?
400÷(1600+400),
=400÷2000,
=0.2,
=20%.
答:便宜了20%.
– Would you do me the favor to help repair my motorbike?
-- _________.
A.Yes, that’s right
B.No trouble
C.Never mind
D.With pleasure
有时候疾病是偶然的。