原式=3×3+|-3×12|-（22）2，
=3+32-12，
=4．
故答案为：4．
(2013·皖南八校第一次联考)He is only too ready to help others, seldom, ________， refusing them when they turn to him.
A．if never
B．if ever
C．if not
D．if anything
请问左镇人的性别和年龄？
