1,6,20,56,144,()A.256B.312C.352D.3843,2,11,14,()34A.18B.21C.24D.271,2,6,15,40,104,()A.329B.273C.225D.1852,3,7,16,65,321,()A.4546B.4548C.4542D.454411/26/1117/2923/38()A.117/191B.122/199C.28/45D.31/47答案1.C6=1x2+420=6x2+856=20x2+16144=56x2+32144x2+64=288+64=3522.D分奇偶项来看:奇数项平方+2;偶数项平方-23=1^2+22=2^2-211=3^2+214=4^2-2(27)=5^2+234=6^2-23.B273几个数之...