Răspunsuri

2014-09-17T18:46:48+03:00
(2x+7)×1/10=2.5+1 ⇒2x+7=3.5×10 ⇒2x+7=35⇒ 2x=35-7⇒2x=28⇒ x=28÷2⇒ x=14, iar 14∈N
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