Topic : Inequality-Comparison
from: category_eng
1.

2.
use subtraction!
3.

4.

5.
fraction related
6.

7.

8.
region of inequality
9.

10.

11.
express the situation mathematically.
12.

13.
s: (x+2y)+(x+4y)=2x+6y c: (x+7y) s-c=x-y>0
14.

15.
could be!!..
use 0 10y/(y+y)<10y/(x+y)<10y/(0+y )
Good luck~
1. B
2.
use subtraction!
3. A
4. A
5. E
fraction related
6. E
7. A
8. E
region of inequality
9. d
10. c
Understanding
11. c
Understanding
express the situation mathematically.
12. E
Modification
13. A
s: (x+2y)+(x+4y)=2x+6y c: (x+7y) s-c=x-y>0
14. A
15. D
could be!!..
use 0 10y/(y+y)<10y/(x+y)<10y/(0+y )
Good luck~