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1#
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2#
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3#
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4#
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5#
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6#
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7#
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8#
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9#
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10#
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11#
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12#
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13#
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14#
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15#
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16#
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17#
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18#
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发表于 2012-8-23 00:31
发表于 2012-8-23 19:07
指点一下啊,就一个表情我无法理解啊……
导数的想法不错,咋我没想到……
这个结论怎么证哟?