Odpowiedzi

2009-12-08T20:36:28+01:00
96/100x+60/100y=39 |*100
x+y=52

96x+60y=3900
x=52-y

96(52-y)+60y=3900
x=52-y

4992-96y+60y=3900
x=52-y

-36y=-1092 |*(-36)
x=52-y

y=30 i 1/3
x=21 i 2/3
2009-12-08T20:41:17+01:00
96/100x+60/100y=39
x+y=52

x=52-y

96/100 × (52 - y) + 60y/100 = 39
4992/100 - 96y/100 + 60y/100 = 39
4992/100 - 36y/100 = 39
4992/100 - 39 = 36y/100
1092/100 = 36y/100
36y = 1092
y = 91/3 = 30,(3)
x = 21,(6)