Question

rezolvati in multimea numerelor naturale ecuatiile: a) xy+4=10 b) xy-5=6 c) (x+1)•(y+3)=12 d) x(y+1)=45 e) 2 supra x =8 f) 4 supra x=17-2010 supra 0

Answer 1

a) xy=6...x=6/y
b)xy=11...x=11/y
c)xy+3x+y+3=12...xy+3x+y=9...xy+3x=9-y...x(y+3)=9-y...x=(9-y)/(y+3)
d)x(y+1)=45...x=45/(y+1)
e)2/x=8...8x=2...x=1/4
f)4/x=(17-2010)/0 /* Numitorul nu poate fi 0!! /* rezulta ca ecuatia nu are solutii.