题目

NEW YORK— Picking a Christmas tree takes most people a few minutes, or a couple of hours if they head for the woods. Dave Murbach needs 11 months. Almost every day of every year, Murbach’s thoughts turn to vision of a perfectly shaped evergreen tree that will take everyone's breath away.      Murbach is the man responsible for finding the towering tree that makes more attractive Manhattan’s Rockefeller Center each Christmas season.      “I'm always looking for a tree,” the center's chief gardener says. “I look for it even when I go to the beach in the summer. It' s li计算（1）-8-12+2                       （2）0.5+(14)-（-2.75）+(×12)（3）-32-[(-23)+(-14)]÷112（4）-32-[(-23)+(-14)]（5）-9957×14（要求用简便计算）