数字推理。给你一个数列,但其中缺少一项或两项,仔细观察数列的排列规律,选择你认为最合适的一个答案。

2024-12-22 18:27:22
推荐回答(4个)
回答1:

都选C,D1个不说了,简单
D2个是因为75 150 300 600 是一次的2倍关系
而括号,30,170,460,之间的关系是这样的来的,300减去150是150 170减去30 是140 而140+150+170为460
同里,30减去括号+30+(150——75)要等于170 所以括号里为—35

回答2:

12,15,24,51,132都能被3整除,且偶,奇,偶,奇,偶,下一个只有C符合
C,偶数项是75,150,300,600,成倍增长;
奇数项是(),30,170,460,-35*2+100=30,30*2+110=170,170*2+120=460,C是这个规律,这样有点牵强,不知正解

回答3:

12,15,24,51,132,(375)
X2=15=12+3^1
X3=24=15+3^2
X4=51=24+3^3
所以Xn=X(n-1)+3^(n-1) (n不等于1)
n=6时 X6=375

(-35),75,30,150,170,300,460,600
X1=600
X2=460
X3=300=X(3-2)/2
X4=170=X2-X3+10
X5=150=X(5-2)/2
X6=30=X4-X5+10
X7=75=X(7-2)/2
n为奇数时Xn=X(n-2)/2 (n不等于1)
n为偶数时Xn=X(n-2)-X(n-1)+10 (n不等于2)
所以X8=X6-X7+10=-35

回答4:

2. 15-12=3
24-15=9
51-24=27
132-51=81
x-132=3^5=81*3=243
x=243+132=375
C

3.没找出

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