问题
单项选择题
(23-1)(23+1)(26+1)(212+1)=（）。
A. (224-1)
B. (224-1)
C. (248-1)
D. (296+1)
E. 26(212-1)
答案
参考答案：A
解析：
is equal to (212-1) (212+1), which is equal to (212+1)(26+1)(26-1), which is equal to (212+1)(26+1)(23-1)(23+1).