ok the answers are as following
A. -1 over 20
B.7 over 9
C. 1 over 20
D.-7 over 9
Simplify: -4 over 5 + 3 over 4?
2009-06-13 3:31 pm
回答 (10)
2009-06-13 4:34 pm
✔ 最佳答案
Find the LCM (least common multiple) of 5 and 4.5 = ...........5
4 = 2 x 2
-----------------------
...= 2 x 2 x 5
...= 20
-4/5 + 3/4
= (-4 * 4)/(5 * 4) + (3 * 5)/(4 * 5)
= -16/20 + 15/20
= -1/20
(answer A)
2009-06-14 7:59 am
- 4/5 + 3/4 =
- 16/20 + 15/20 =
- 1/20.
A. is correct.
- 16/20 + 15/20 =
- 1/20.
A. is correct.
2009-06-13 10:57 pm
the answer is A -1 over 20//
2009-06-13 10:57 pm
A. -1 over 20
2009-06-13 10:52 pm
A
2009-06-13 10:52 pm
- 4
---------------
8
-----
4
- 16
-------
8
- 2
But this is NOT what you mean !
You mean :-
- 4 / 5 + 3 / 4
- 16 / 20 + 15 / 20
- 1 / 20
OPTION A
---------------
8
-----
4
- 16
-------
8
- 2
But this is NOT what you mean !
You mean :-
- 4 / 5 + 3 / 4
- 16 / 20 + 15 / 20
- 1 / 20
OPTION A
2009-06-13 10:48 pm
-4/5=-16/20+11520= -1/20 A
2009-06-13 10:47 pm
first get a common denominator and then do simple addition. You end up with
-16/20 + 15/20 = -1/20.
-16/20 + 15/20 = -1/20.
2009-06-13 10:43 pm
Look for a common denominator, in this case, the common denominator for 5 and 4 is 20
so -4 over 5 is also -16 over 20
and 3 over 4 is also 15 over 20
Now that you have a common denominator for both, just compute for the numerator.
-16 over 20 + 15 over 20 = -1 over 20
so -4 over 5 is also -16 over 20
and 3 over 4 is also 15 over 20
Now that you have a common denominator for both, just compute for the numerator.
-16 over 20 + 15 over 20 = -1 over 20
2009-06-13 10:36 pm
A
change both to have 20 in bottom line ie
-16 / 20 and 15 / 20
change both to have 20 in bottom line ie
-16 / 20 and 15 / 20
收錄日期: 2021-05-01 12:29:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090613073153AAlurah