What is the value of a4 - b4 ?
(1) a2 - b2 = 16
(2) a + b = 8
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.
可以算出a b 的具体值
算出a-b后,结合a+b后即可得出a^2+b^2.