之六

steven.wei

34.DS: x+y=?
(1)2^x+8^y=256 (2)3^2x+9^y=81

我认为应该选E，不知道是否是正确？

卧室春竹

偶觉得是A       应为 1 要成立 y只能是 o 吧？！！！

x y必须是整数嘛？

isenetlab12

the answer should be E if x and y must not be integer, since in (1)x<8, y<3, can find many combination to meet the equation in(2) x<2,y<2 can also find many combiantion to meet the equation but no any answer can meet the two equation at the same time if x and y must be integer, then no answer to meet any of the two equations rgiht? the idea in upstair is wrong since y=0, then 2^x=255, x will not be an integer

卧室春竹

对...e

steven.wei

多谢，多谢。