2,4,9,24,58,126,( ) A.255 B.259 C.261 D.268 1,10,31,70,133,( ) A.136 B.186 C.261 D.268(1) 24,58,126,( ) A.255 B.259 C.261 D.268(2) 1,10,31,70,133,( ) A.136 B.186 C.261 D.268
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![2,4,9,24,58,126,( ) A.255 B.259 C.261 D.268 1,10,31,70,133,( ) A.136 B.186 C.261 D.268(1) 24,58,126,( ) A.255 B.259 C.261 D.268(2) 1,10,31,70,133,( ) A.136 B.186 C.261 D.268](/uploads/image/z/342520-16-0.jpg?t=2%2C4%2C9%2C24%2C58%2C126%2C%EF%BC%88+%EF%BC%89+A.255+B.259+C.261+D.268+1%2C10%2C31%2C70%2C133%2C%28+%29+A.136+B.186+C.261+D.268%281%29+24%EF%BC%8C58%EF%BC%8C126%EF%BC%8C%EF%BC%88+%EF%BC%89+A.255+B.259+C.261+D.268%282%29+1%2C10%2C31%2C70%2C133%2C%28+%29+A.136+B.186+C.261+D.268)
2,4,9,24,58,126,( ) A.255 B.259 C.261 D.268 1,10,31,70,133,( ) A.136 B.186 C.261 D.268(1) 24,58,126,( ) A.255 B.259 C.261 D.268(2) 1,10,31,70,133,( ) A.136 B.186 C.261 D.268
2,4,9,24,58,126,( ) A.255 B.259 C.261 D.268 1,10,31,70,133,( ) A.136 B.186 C.261 D.268
(1) 24,58,126,( )
A.255 B.259 C.261 D.268
(2) 1,10,31,70,133,( )
A.136 B.186 C.261 D.268
2,4,9,24,58,126,( ) A.255 B.259 C.261 D.268 1,10,31,70,133,( ) A.136 B.186 C.261 D.268(1) 24,58,126,( ) A.255 B.259 C.261 D.268(2) 1,10,31,70,133,( ) A.136 B.186 C.261 D.268
一,碰到这样的题,一时半会看不出来,最简单的方法,构建网络,依次做差,直到找到规律
依次做差为
2,4,9,24,58,126, ( 261 )
2 5 15 34 68 (135)
3 10 19 34 (67)
7 9 15 (33)
2 6 (18)
2 6 18 三倍等比,比较牵强,我找不到其他规律了,等高手吧
二,1 10 31 70 133 (226)
(1)做差 二级等差有规律
(2)多次方 1=1*3+0 10=2*3+2 31=3*3+4 70=4*3+6 133=5*3+8 226=6*3+10
(2) B.186