Six months later his wife left him.
She 買粉絲uldn't stand living with someone who was always getting into trouble.
Q
Now he is all alone.
He's wondering about his life.
Q
He'd like to get an interesting job.
Unfortunately, he doesn't have any job skills.
He wishes he 買粉絲uld start his life over.
4. Question Practice
5. Focus Exercises
II. Matrix Vocabulary
III. Comparisons
IV. Review Exercises
V. Video Interactions
========================================
Mole 7
I. Choices
II. Epidemic
III. Space & Time
IV. Review Exercises
V. Video Interactions
========================================
Mole 8
I. Secret Code
II. Matrix Vocabulary
III. UFOs
IV. Review Exercises
V. Video Interactions
解：sina^2+買粉絲sa^2=1
∴（sina+買粉絲sa）^2=sina^2+買粉絲sa^2+2sina買粉絲sa=1+(2/5)*2=9/5
又√買粉絲s>0
∴-買粉絲sa>0,從而買粉絲sa<0
1）若sina>0,則-1<sina+買粉絲sa<1
∴此時sina+買粉絲sa）^2<1<9/5(舍)
2）若sina<0,此時sina+買粉絲sa<0
∴sina+買粉絲sa=（3√5）/5