標題:

-2,-7,-12,-17的通項

發問:

-2,-7,-12,-17的通項

最佳解答:

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通項=-2+(n-1)(-5)=3-5n

其他解答:

-2,-7,-12,-17的通項: -2+(n-1)(-5) =-2-5n+5 =-2+5-5n =3-5n|||||通項 = a + ( n - 1 )d = - 2 + - 5 ( n - 1 ) = - 2 + - 5n + 5 = 3 + - 5n = 3 - 5n So the answer is ( 3 - 5n ) .
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