1.1/8,1/6,9/22,27/40,( ) A.27/16 B.27/14 C.81/40 D.81/44 求详解

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/06 07:07:29

1.1/8,1/6,9/22,27/40,( ) A.27/16 B.27/14 C.81/40 D.81/44 求详解
1.1/8,1/6,9/22,27/40,( )
A.27/16 B.27/14 C.81/40 D.81/44
2.3,4,12,18,44,( )
A.44 B.56 C.78 D.79
3.4,5,15,6,7,35,8,9,( )
A.27 B.15 C.72 D.63
4.1526,4769,2154,5397
A.2317 B.1545 C.1469 D.5213

1.原式通分为：1/8,3/18,9/22,27/40,由此可得最后一项分子为81.分子规律为：3^2-1,4^2+2,5^2-3,6^2+4,最后项分母为7^2-5=44.所以选D.
2.此时规律为 3*2-2=4,4*2+4=12,12*2-6=18,18*2+8=44,最后项为44*2-10=78.选C.
3.15=(4-1)*5,35=(5-1)*7,最后项为 (8-1)*9=63.所以选D.
4.该式各项的四位数的个位+千位=十位+百位.1+6=5+2,4+9=7+6,2+4=5+1,5+7=3+9,所以只有C符合这种关系,选C.

1.1/8,1/6,9/22,27/40,( ) A.27/16 B.27/14 C.81/40 D.81/44 求详解倍数数列问题 [例40]21,3,12,27,30,( ) A.10 B.11 C.15 D.20 求详解. 怎么的到的,A,B,C,D求详解 5 9 15 17 ( ) A 21 B 24 C 32 D 34 求详解. 数字求规律25 58 91 20 69 A.14 B.27 C.39 D.9 16 17 19 22 27 () 45A 35 B 34 C 36 D 372 1/3 8 1/9 () 1/81A 已知a=3^22,b=4^14,c=9^10,d=8^10,则abcd的大小关系是详解和原因! 1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解 a+b+c+d=2a;a+b+c+d=4b;a+b+c+d=6c;a+b+c+d=8d 求a,b,c,d 1,2,4,3,5,6,9,18,( ) A.14 B.24 C.27 D.36 49 109 43 79 19 （）求详解 A 73 B 109 C -518 D -2 求详解：you look much thinner ( ) she is.A.as B.so C.and D.than