1.4 5 7 11 19 ( A.27 B.31 C.35 D.412.8/9 ―2/3 1/2 ―3/8 ( A.9/32 B.5/72 C.8/32 D.9/233.0 6 24 60 120 ( A.180 B.210 C.220 D.2404

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1.4571119(A.27B.31C.35D.412.8/9―2/31/2―3/8(A.9/32B.5/72C.8/32D.9/233.062460120(A.180B.210C.220D.2404

1.4 5 7 11 19 ( A.27 B.31 C.35 D.412.8/9 ―2/3 1/2 ―3/8 ( A.9/32 B.5/72 C.8/32 D.9/233.0 6 24 60 120 ( A.180 B.210 C.220 D.2404
1.4 5 7 11 19 ( A.27 B.31 C.35 D.412.8/9 ―2/3 1/2 ―3/8 ( A.9/32 B.5/72 C.8/32 D.9/233.0 6 24 60 120 ( A.180 B.210 C.220 D.2404.1 1 ―1 ―5 ( A.一1 B.一5 C.一9 D.一115.4 4 2 ―2 ( A.一2 B.一4 C.一8 D.一16请写出解题步骤,先谢了

1.4 5 7 11 19 ( A.27 B.31 C.35 D.412.8/9 ―2/3 1/2 ―3/8 ( A.9/32 B.5/72 C.8/32 D.9/233.0 6 24 60 120 ( A.180 B.210 C.220 D.2404
1题选35,各项差为,1,4,9,16为1,2,3,4的平方2题,9/32前项乘以-3/4等于后项3题选B ,210各项是1,2,3,4,5,6的三次方减去1,2,3,4,5,64题,选D-11,前减后得0,2,4,6为等差5题,选C,-8等差为0,2,4,6,大意了,前面是一正两负,不是等比数列