题目内容
在等差数列{an}中,若a9=6,则a7-
a3=______.
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∵a9=a1+8d=6,
a7-
a3=a1+6d-
(a1+2d)=
a1+
d=
(a1+8d)=
×6=4
故答案为:4
a7-
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| 16 |
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| 3 |
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故答案为:4
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