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算术平均数的数学性质有哪些?
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【简答题】古诗文填空。 ( ① — ④ 题必做， ⑤⑥ 题任选一题 )(6 分 ) ① 会当凌绝顶， ▲ 。 ( 杜甫《望岳》 ) ② ▲ ，无案牍之劳形。 ( 刘禹锡《陋室铭》 ) ③ 做人应该有忧患意识，用孟子的话说，就是 “ 生于忧患而 ▲ 也。 ④ 读到李商隐《无题》中 “ 春蚕到死丝方尽，蜡炬成灰泪始干 ” 的句子，就会让我们很自然地联想到龚自珍《己亥杂诗》中的名句 “ ▲ ，化作春泥更护花。 ”...
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【简答题】名句填写: ( ),化作春泥更护花。
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