What is the d'th term of -135, -265, -409, -573, -763, -985, -1245, -1549?
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What is the u'th term of -209, -207, -205?
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What is the x'th term of 63, 100, 139, 174, 199, 208, 195?
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What is the k'th term of 93, 404, 933, 1680?
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What is the i'th term of -263, -533, -803, -1073, -1343?
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What is the z'th term of -123, -249, -375?
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What is the x'th term of -26, -70, -144, -248?
一个美术生