[转帖]9.18 Math jj

smart

X=?

1. |X-5|=10

2. |X|-5=10

My answer: C

An= 4An-1 +3, A3=X, A1=?

My answer : (X-15)/16

50 pounds 岩石中 5% 为金属, ten times as much sliver as gold, gold=?

因为谁是谁的几倍 我每次都会弄混 所以不写答案了

2005-09 碰到的jj有

68,111,118,129,130,132

不过130那提我印象中我的条件一好像是众数等于平均数