số nguyên tố

B

baochauhn1999

$a=5;b=7.......................................................................$
 
P

phianhchau001

giải :D

2̣.(a+b)[TEX]\vdots 12\Rightarrow a+b \vdots 12[/TEX] hoặc [TEX]a+b \vdots 6[/TEX]
 
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