If a =(27)(3−2)and x =(6)(3−1), then which of the following is equivalent to(12)(3−x) x (15)(2−a)?
A.–2245 × 320 × 5
B.25
C.52
D.24 × 38 × 5
E.2245 × 320 × 5
我的答案：
If a =fff\((27)(3^{-2})\)/fffand x =fff\((6)(3^{-1})\)/fff, then which of the following is equivalent tofff\((12)(3^{-x})\)/fff x fff\((15)(2^{-a})\)/fff?
