Răspunsuri

2014-09-28T16:52:33+03:00
B/5 = C/6 = D/7= k
B = 5k
C = 6k
D = 7k
=> 5k+ 6k + 7k= 360- 90
5k + 6k + 7k = 270
18k = 270
k= 270/ 18
k= 15
=> B= 5k= 5 x 15= 75 grade
=> C= 6k= 6 x 15= 90 grade
=> D= 7k= 7 x 15= 105 grade
1 5 1