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Stiind ca 5a+2b supra 7a-2b= 1 supra 4,calculati a supra b

Răspuns :

(5a+2b)/(7a-2b)=1/4
4(5a+2b)=7a-2b
20a+8b=7a-2b
20a-7a=-8b-2b
13a=-10b
a/b=-10/13