You've just come home, after living abroad for a few years. Since you've been away, has this country changed for the better—or for the worse? If you've just arrived back in the UK after a fortnig
One day, a young man was cleaning out his late grandfather’s belongings when he came across a bright red envelope. Written on the front were the words, To my grandson. Recognizing his grandfather's
或
.
且a=6，得b=4．
=1.
，且a=6,得b=9．
=1.