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DETERMINATI PE X STIIND CA 3x+1 /2x+5 din 252 este 20

Răspuns :

Icecon2005
[tex] \frac{3x+1}{2x+5}*252=20 \\ \\ 252(3x+1)=20(2x+5) \\ \\ 63(3x+1)=5(2x+5) \\ \\ 189x+63=10x+25 \\ \\ 189x-10x=25-63 \\ \\ 179x=-38 \\ \\ x=- \frac{38}{179} [/tex]
Nitugheorghe57
3x+1/2x+5x252=20⇒252(3x+1)/2x+5=20⇒756x+252/2x+5=20⇒756x+252=20(2x+5)⇒756x+252=40x+100⇒756x-40x=-252+100⇒716x=-152⇒x=-152/716⇒x=76/358
succes

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