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[主观题]
某商品经过8月份与9月份连续两次降价,售价由m元降到了n元,则该商品的售价平均每次下降了20%.
(1)m-n=900. (2)m+n=4100.
A.条件(1)充分,但条件(2环充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
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