if x〈y ,that which one is wong 2x〈x+y 3-x〉3-y 2x〈2y -2y〈2x?

👨🏻‍🏫 學術台數學

[匿名]

2015-08-27 11:40 am

回答 (1)

用戶2053

2015-08-27 12:38 pm

2x < x + y
2x - x < x + y - x
x < y is true.

3 - x > 3 - y
- x > - y
x < y is true.

2x < 2y
x < y is true.

- 2y < 2x
- y < x
- x < y is wrong!

👍 4 👎 0