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x supra y =2supra 5 si x+y = 98

Răspuns :

x/y=2/5=>x=2y/5
x+y=98 
2y/5 +y =98
2y+5y=490
7y=490 =>y=70
x+y=98 =>x=98-y=98-70=28
x/y=2/5
x+y=98 => x=98-y
inlocuim in prima 
98-y/y = 2/5
490-5y=2y
490=7y
y=70 => x+70=98 x=98-70=28