8年以后再战770（V44 Q51）,分享基金

mandy1991

zhoujy 发表于 2018-5-10 14:29
楼楼好厉害，另外不太明白数学第八题呢

就X=3Z Y=2Z, 所以平均值是3Z。一定是3的倍数，其他选项都不是3的倍数

mandy1991

bzy! 发表于 2018-5-10 14:04
1. They refused to admit her, not least because (= there were several reasons but this was an impo ...

同意！               

mandy1991

bzy! 发表于 2018-5-10 14:04
1. They refused to admit her, not least because (= there were several reasons but this was an impo ...

同意！               

zhoujy

mandy1991 发表于 2018-5-10 14:33
就X=3Z Y=2Z, 所以平均值是3Z。一定是3的倍数，其他选项都不是3的倍数

嗯嗯，明白啦！谢谢楼楼

billyisfragile!

数列A1=2, A2=3,A3=A1+A2, 后面的数都是前面所有的数的和，问第24个数是第20个数的几倍。
特殊数列列一下就会发现是：2 3 5 10 20 40 ...，所以后面的数每一个都是前面的2倍，所以2的4次方，答案是16

a1 2
a2 3
a3 5
a4 10
a5 20 = (2^1)(10)
a6 40 = (2^2)(10)
a7 80 = (2^3)(10)
a8 160 = (2^4)(10)
a9 320 = (2^5)(10)
a10 640 = (2^6)(10)
a11 1280 = (2^7)(10)
a12 2560 = (2^8)(10)
a13 5120 = (2^9)(10)
a14 10240 = (2^10)(10)
a15 20480 = (2^11)(10)
a16 40960 = (2^12)(10)
a17 81920 = (2^13)(10)
a18 163840 = (2^14)(10)
a19 327680 = (2^15)(10)
a20 655360 = (2^16)(10)
a21 1310720 = (2^17)(10)
a22 2621440 = (2^18)(10)
a23 5242880 = (2^19)(10)
a24 10485760 = (2^20)(10)

a24/a20 = 10485760/655360 = (2^20)(10)/(2^16)(10) = 2^4 = 16

billyisfragile!

zhoujy 发表于 2018-5-10 14:29
楼楼好厉害，另外不太明白数学第八题呢

x = 3y = 6z

x = 6z
y = 2z

x + y + z = 6z + 2z + z = 9z

9z/3 = 3z

Answer : 15 (Multiple of 3)

girlcanfun

好厉害！！！！吸吸欧气哦~~~祝我自己上7！！！！！！！

張飛不會飛

顶楼主！               

清澈眼中筐似海

大神。牛比

祝福我吧

66666666有神快拜