Odpowiedzi

2010-03-29T21:59:53+02:00
X+y=16
7x+9y=16

x=3,5
y=4,5
2010-03-29T22:00:17+02:00
16 = 2a + 2b

jezeli stosunek jest 7:9
to a = 7x, b = 9x

16 = 2 * 7x + 2 * 9x
16 = 14x + 18 x
16 = 32 x / :32
x = 1/2

a więc: a = 7 * 0,5 = 3,5
b = 4,5
2010-03-29T22:04:29+02:00
...............9x...........................
......________________...............
.7x.|.........................|..............
.....|________________|..............
.............................................
16 = 2×7x+2×9x
16 = 32x
x = 0,5cm

Odp.: Jeden bok ma 3,5cm, a drugi 4,5.