1/3 3/9 2/3 13/21 ( )A.17/27 B.17/26 C.19/27 D.19/28答案是B为什么?
1/3 3/9 2/3 13/21 ( )A.17/27 B.17/26 C.19/27 D.19/28答案是B为什么?
1/3,/3/9,2/3,13/21,( )A.17/27 B.17/26 C.19/27 D.19/28答案是A
1)2,5,9,14,17,21 (A 24,B 26,C 28,D 30这里哪个是答案)
1/3 3/9 2/3 13/21 ( ) A.17/27 B.17/26 c.19/27 D.19/28
1/3 3/9 2/3 13/21 ( )A.17/27 B.17/26 C.19/27 D.19/28 求下一个.
数字推理 1/3 3/9 2/3 13/21 ( ) a.17/27 b.17/26 c.19/27 d.19/28 请
2,3,6,9,17,( )A.33 B.27 C.45 D.19
3/9 2/3 13/21 ( ) A.17/27 B.17/26 C.19/27 D.19/28
数学解方程,复杂啊-12=3a+2b+c ①0=-a+b-c+d②0=27a+9b+3c+d③1=a+b+c+d④帮忙解
a,b,c,d>0 证(a/(b+2c+3d))+(b/(c+2d+3a))+(c/d+2a+3b))+(d/(a+2b
a、b、c、d表示4个有理数,其中每三个数之和是-1,-3,2,17,求a、b、c、d.
找规律 1,3,2,8,12,28,(?) 答案选D,怎么算的?求解释! A.15 B.32 C.27 D. 52