Aptitude - Decimal Fraction - Discussion
Discussion Forum : Decimal Fraction - General Questions (Q.No. 1)
1.
| Evaluate : | (2.39)2 - (1.61)2 |
| 2.39 - 1.61 |
Answer: Option
Explanation:
| Given Expression = | a2 - b2 | = | (a + b)(a - b) | = (a + b) = (2.39 + 1.61) = 4. |
| a - b | (a - b) |
Discussion:
21 comments Page 1 of 3.
Ishita said:
1 year ago
(2.39)²–(1.61)² so it is in the form of a²–b² so it will be( a+b)(a-b) so it will be (2.39+1.61)(2.39-1.61) so by solving we get
2.39 +1.61 =4.00 and 2.39-1.61= 0.78.
Now as in down i.e denomination also 2.39-1.61 is given which is 0.78.
So, we can cut the numerator and denominator i.e
(4.00×0.78)/0.78 = 4 if we cut the numerator 0.78 and denominator 0.78.
So here comes the answer. 4.
2.39 +1.61 =4.00 and 2.39-1.61= 0.78.
Now as in down i.e denomination also 2.39-1.61 is given which is 0.78.
So, we can cut the numerator and denominator i.e
(4.00×0.78)/0.78 = 4 if we cut the numerator 0.78 and denominator 0.78.
So here comes the answer. 4.
(13)
Franky said:
9 years ago
This is easy, just (a + b)(a - b)/(a - b).
Then just by cancelling the both minus and remaining a+b is the answer.
Formula : (a^2) - (b^2) = (a + b)(a - b)/a - b.
Enter the amount: (2.39 + 1.61)(2.39 - 1.61)/2.39 - 1.69).
Cancel both 2.39 - 1.61)/(2.39 - 1.69).
Then remaining in the numerator is 2.39 + 1.61 = 4.
So, the answer is 4.
Then just by cancelling the both minus and remaining a+b is the answer.
Formula : (a^2) - (b^2) = (a + b)(a - b)/a - b.
Enter the amount: (2.39 + 1.61)(2.39 - 1.61)/2.39 - 1.69).
Cancel both 2.39 - 1.61)/(2.39 - 1.69).
Then remaining in the numerator is 2.39 + 1.61 = 4.
So, the answer is 4.
Mr.soumya dhwaj said:
6 years ago
See what we have to do is,
(a+b)x(a-b)/(a-b).
(2.39+1.61)x(2.39-1.61) divided by/(2.39-1.61).
Solving them by opening the brackets we get,
4x0.78/0.78.
Now by solving it we get a figure =3.12 divided by/0.78.
Finally, we get = 4 as our answer.
(a+b)x(a-b)/(a-b).
(2.39+1.61)x(2.39-1.61) divided by/(2.39-1.61).
Solving them by opening the brackets we get,
4x0.78/0.78.
Now by solving it we get a figure =3.12 divided by/0.78.
Finally, we get = 4 as our answer.
(4)
Ashwani said:
7 years ago
Here the formula of a2-b2 = (a+b)(a-b).
so (a+b)(a-b)/(a-b) here both (a-b) are canceled,
so (a+b) is reminder here a= 2.39 & b= 1.61,
then 2.39+1.61=4 .
so (a+b)(a-b)/(a-b) here both (a-b) are canceled,
so (a+b) is reminder here a= 2.39 & b= 1.61,
then 2.39+1.61=4 .
(4)
Chakra said:
2 years ago
Here (A+B) (A-B) / (A-B).
Here (A-B) from the numerator and denominator are canceled then (A+B) is the remainder.
So (2. 39+1. 61) =4.
Here (A-B) from the numerator and denominator are canceled then (A+B) is the remainder.
So (2. 39+1. 61) =4.
(7)
Danny sawkmie said:
1 decade ago
Iven Expression = a2 - b2 = (a + b)(a - b) = (a + b) = (2.39 + 1.61) = 4.
a - b (a - b)
Explain clearly
a - b (a - b)
Explain clearly
Aptitute said:
1 decade ago
Given Expression = a^2 - b^2 = (a + b)(a - b).
(a^2 - b^2)/(a - b) = (a + b) = (2.39 + 1.61) = 4.
(a^2 - b^2)/(a - b) = (a + b) = (2.39 + 1.61) = 4.
Praveen kumar said:
1 decade ago
2.39*2.39 = 5.7121.
1.61*1.61 = 2.6565.
2.39-1.61 = 0.78.
Its nothing 5.7121-2.6565/0.78 = 4.
1.61*1.61 = 2.6565.
2.39-1.61 = 0.78.
Its nothing 5.7121-2.6565/0.78 = 4.
Suni said:
10 years ago
(a+b)(a-b)/(a-b), its simple division where a-b gets cancelled an that = a+b.
Rohit said:
4 years ago
Why we cannot use separation of denominators? Explain, please.
(1)
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