题目

Bill was five years old last week. He is very clever. He always likes to touch (触摸) everything he sees. But his father, Mr Hunt never lets his little son touch anything in his study. When Bill puts his hand on something in it he will say, “Don’t touch it , Bill!”    One day the boy was standing by the window when his father was reading a book. Suddenly the boy pointed（指着） to the sky and said , “Look, dad, a plane!” “Oh, dear,” said his father and he didn’t stop reading. “But don’t touch it, Bill.” 1. What does the word “study” mean in the story若a，b都是实数，且1a-1b-1a+b=0，则(ab)3+(ba)3= ．