Is x4 + y4 > z4 ?
(1) x2 + y2 > z2
(2) x + y > z
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.
不仅要考虑正负,还有条件并没有给出整数,所以要考虑非整数的情况
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