Odpowiedzi

2010-03-10T15:00:08+01:00
85%(x-3)=x-15
85/100(x-3)=x-5
0,85x-2,55 = x-5 /- 0,85x
-2,55 = 0,15x - 5 /+5
2,45 = 0,15x /:0,15
x = 16 i 1/3
2010-03-10T15:04:43+01:00
85%(x-3)=x-15
85/100x - 2 i 55/100 = x - 15
- 2 i 55/100 + 15 = x - 85/100 x
12 i 45/100 = 15/100 x (dzielimy obie strony przez 15/100 )
83 = x

2010-03-10T15:05:34+01:00
85/100(x-3)=x-5

85/100 - 255/100 = x-5 / *100

85x - 255 = 100x - 500

85x - 100x = -500 + 255

-15x= -245 / * (-15)

x = 16 i jedna trzecia