Odpowiedzi

2009-09-20T15:56:13+02:00
(x+y)/2=4x/7
7(x+y)=8x
7x+7y=8x
7x-8x=7y
-x=-7y
x=7y

x/y=7y/y=7
2009-09-20T16:07:16+02:00
Tak, wynosi 7

x+y /2=4x/7
7x+7y=8x
7y=x
7=x/y
2009-09-20T18:05:35+02:00
(x+y)/2=4x/7
7(x+y)=8x
7x+7y=8x
7x-8x=7y
-x=-7y
x=7y