Mathematics
Junior High
Resolved
求解（急用）
6.小英計畫一月背50個英文單字,以後每個月皆會比上個月多背d個英文單字,已知她在
同年的十二月當月背了270個英文單字,則她在
同
年
的七月當月背了多少個英文單字
?
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