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Nguyễn Hưng Phát 11/12/2017 at 17:38
We have:\(\left\{{}\begin{matrix}a+b=11\\a.b=24\end{matrix}\right.\)\(\Rightarrow ab+a+b=35\Rightarrow ab+a+b+1=36\Rightarrow\left(a+1\right)\left(b+1\right)=36\)
We have table:(because a,b same kind so not consider a,b negative)
a+1 1 2 3 4 6 9 12 18 36 b+1 36 18 12 9 6 4 3 2 1 a 0 1 2 3 5 8 11 17 35 b 35(unsatisfactory) 17(unsatisfactory) 1(unsatisfactory) 2(unsatisfactory) 5(unsatisfactory) 3(satisfy) 2(unsatisfactory) 1(unsatisfactory) 0(unsatisfactory) So the absolute difference between those two number is:\(\left|8-3\right|=\left|5\right|=5\)
Selected by MathYouLike -
KEITA FC 8C 19/12/2017 at 12:49
We have:{a+b=11a.b=24{a+b=11a.b=24⇒ab+a+b=35⇒ab+a+b+1=36⇒(a+1)(b+1)=36⇒ab+a+b=35⇒ab+a+b+1=36⇒(a+1)(b+1)=36
We have table:(because a,b same kind so not consider a,b negative)
a+1 1 2 3 4 6 9 12 18 36
b+1 36 18 12 9 6 4 3 2 1
a 0 1 2 3 5 8 11 17 35
b 35(unsatisfactory) 17(unsatisfactory) 1(unsatisfactory) 2(unsatisfactory) 5(unsatisfactory) 3(satisfy) 2(unsatisfactory) 1(unsatisfactory) 0(unsatisfactory)So the absolute difference between those two number is:|8−3|=|5|=5
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So the answer is:
|15-2| = |2-15| = 13
||8-3| = |3-8| = 5
So the answer is 13 or 5
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Tell those numbers are a,b
=> a+b = 11 and ab = 24
=> ab - a - b = 24-11 = 13
=> a(b-1) - b + 1 = 14
=> a(b-1) - (b-1) = 14
=> (a-1)(b-1) = 14
We have table:
a-1 1 14 2 7 b-1 14 1 7 2 a 2 15 3 8 b 15 2 8 3 So (a,b) = (2,15); (15,2); (3,8); (8,3)