var ancestorid_142941='142764'; var isauth_142941='0'; var istop_142941='0'; var iselite_142941='0'; var iscommend_142941='0'; var islock_142941='0'; var title_142941='Re:数字推理'; var body_142941='2*4
6*9
12*16
20*25
30*36
前一个是二级等差数列,后一个是项数的平方也选C
核楼上两个答案殊途同归
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