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问题
填空题
数列{a
n
}的前n项和为S
n
=n
2
+1(n∈N*),则它的通项公式是( )。
答案
写作题
你收到美国笔友Sally 来信后,请你给她写封回信介绍一下你的家庭成员及你们的饮食习惯。40 词左右。
Meals
Father
Mother
Liu Mei
Breakfast
Eggs, apples, bread
Eggs and bananas
Eggs and strawberries
Lunch
Noodles with tomatoes and eggs
Noodles with tomatoes and eggs
Hamburgers and pears
Dinner
Porridge, salad
Porridge and salad
Porridge and salad
Dessert
/
French fries
Ice cream
Dear Sally ,
Thank you for your letter.
Yours,
Liu Mei.
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