zadanie 36 [latex]egin{cases} a + 31\%a = b\ a + b = 5,1end{cases}\ egin{cases} 1,31a - b= 0\ a + b = 5,1end{cases}\ 1,31a + a - b + b = 5,1\ 2,31a = 5,1\ a = frac{510}{231} = frac{170}{77}\ b = 1,31a = frac{131}{100}*frac{170}{77} = frac{131}{10}*frac{17}{77} = frac{2227}{770}\ b - a = frac{2227}{770}- frac{170}{77} = frac{527}{770} approx 0,68 mln[/latex] zadanie 37 a - ilość rozwtoru 30% b - ilość rozwqtoru 60% [latex]egin{cases} a + b = 200 g\30\%a+60\%b = 200g*40\%end{cases}\ egin{cases} 3a + 3b = 600 g\3a+6b = 200g*4end{cases}\ egin{cases} 3a + 3b = 600 g\3a+6b = 800gend{cases}\ 3b - 6b = 600g - 800g\ 3b = 200g\ b = 66frac{2}{3}g\ a = 200g - b = 133frac{1}{3}g[/latex] zadanie 39 a - ilość śmietanki b - ilość mleka [latex]egin{cases} a + b = 200 g\12\%a + 2\%b = 3\%*200gend{cases}\ egin{cases} a + b = 200 g\12a + 2b = 3*200gend{cases}\ egin{cases} a + b = 200 g\6a + b = 300gend{cases} 6a -a = 300g - 200g\ 5a = 100g\ a = 20g\ b = 180g[/latex]
