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1) stiind ca 4x-3x/3x-y=1/5 determinati valoarea raportului numerelor x si y
2) daca 3a/2b=5/3 si 5a+2b=204, atunci calculati diferenta numerelor a si b


Răspuns :

1)4x-3x/3x-y=1/5
4x-3x/1=3x-y/5
x/1=3x-y/5
5x=3x-y
2x=-y
x/1=-y/2=>x/y=-1/2
2)3a/2b=5/3=>3a/5=2b/3
9a=10b=>a=10b/9
5a+2b=204
50b/9+2b=204
68b/9=204
b=204*9/68=>b=3*9=>b=27
a=270/9=>a=30
30-27=3
sper ca te-am ajutat