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Prove the statement about the divisibility of integers

If d I (a+b), and d I a, then d I b

2007-09-05 03:31:24 · 4 answers · asked by Dan 1 in Science & Mathematics Mathematics

4 answers

We can use the distributive property of the division with respect to the sum.

(a +b)/d = a/d + b/d. By assumption, it follows (a + b)/d and a/d are integers, which implies so is b/d. Therefore, d|b.

2007-09-05 03:42:03 · answer #1 · answered by Steiner 7 · 1 0

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2016-10-04 00:47:49 · answer #2 · answered by ? 4 · 0 0

I would suggest that you learn to ask questions in a recognizable form. What is that crap you wrote??
and the answerer before me knows that 37239=sajkdfj he is smarter than both of us!!

2007-09-05 03:40:30 · answer #3 · answered by Mike M 4 · 0 3

d|(a+b) ⇔ ∃c: cd=(a+b)
d|a ⇔ ∃k: kd=a

Then if d|(a+b) and d|a, then cd = a+b = kd + b, so b = (c-k)d, which means that d|b. Q.E.D.

2007-09-05 03:36:37 · answer #4 · answered by Pascal 7 · 1 0

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