If kmn≠0, is ~$x \over m$~(m2 + n2 + k2) = xm + yn + zk ?

(1) ~$z \over k$~=~$x \over m$~

(2)~$x \over m$~=~$y\over n$~

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

##### 考题讲解

（1）    若满足条件1，则有zm=xk，无法判断是否满足题目。

（2）    若满足条件2，足有xn=ym，无法判断是否满足题目。