Simplifying an algebraic expression?

2010-03-29 10:14 am
5a/2b + 3b/2a

The answer is 5a^2 +2a^2/2ab
I don't know how to get the answer :(

回答 (6)

2010-03-29 10:23 am
✔ 最佳答案
you want to make the fractions so that they have the same denominator, then you can add them.

so if you multiplied the first one by a/a (this equals one, so it won't change the value of the fraction), you would get 5a^2/2ab
and if you multiplied the second one by b/b, you would get 3b^2/2ab

so now we have 5a^2/2ab + 3b^2/2ab
since they have the same denominator, you can just add the numerators:

= (5a^2 + 3b^2)/2ab
2010-03-29 5:22 pm
5a/2b + 3b/2a

=5a/2b * a/a + 3b/2a *b/b

= 5a^2 /2ab + 3b^2 / 2ab

= (5a^2 +3b^2 ) / 2ab
2010-03-29 6:49 pm
5a/(2b) + 3b/(2a)
= (5a * a)/(2b * a) + (3b * b)/(2a * b)
= 5a^2/(2ab) + 3b^2/(2ab)
= (5a^2 + 3b^2)/(2ab)
2010-03-29 5:42 pm
5a/2b + 3b/2a

=5a/2b * a/a + 3b/2a *b/b

= 5a^2 /2ab + 3b^2 / 2ab

= (5a^2 +3b^2 ) / 2ab
2010-03-29 5:32 pm
I believe you get a common denominator, so you would do
5a*a/2b*a + 3b*b/2a*b
(5a^2+3b^2)/2ab
that's the best I can do
2010-03-29 5:30 pm
Question can be MISREAD in a number of ways due to lack of brackets.

Will have to GUESS that you mean :-

5a / (2b) + 3b / (2a)

5 a ² + 3 b ²
----------------
2a b


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