Odpowiedzi

2010-03-27T14:57:05+01:00
A-jeden bok prostokąta
b-drugi bok prostokąta

2a+2b=16
a/b=7/9

2a+2b=16
9a=7b

2a=16-2b /:2
9a=7b

a=8-b
9(8-b)=7b

a=8-b
72-9b=7b

a=8-b
-9b-7b=-72

a=8-b
-16b=-72 /:(-16)

a=8-b
b=4,5

a=3,5
b=4,5
18 3 18
2010-03-27T14:59:54+01:00
A-jeden bok
b-drugi bok

2a + 2b = 16
7a = 9b

2a= 16 -2b
7a = 9b

a=8-b
7a = 9b

a=8-b
7 * (8-b) = 9b

a=8-b
56 - 7b =9b

a=8-b
-16b = -56 | -16

a= 8-b
b=3,5

a=4,5
b=3,5
17 3 17