[" 3."4fa" a: "b=c:d=e:{2vec g}," th "(3a+5c+7e):(3b+5d+7f)],[" Wridy "vec B| pi],[[" (1) "8:7," (2) "2:1],[" (3) "1:4," (4) "1:2]]

If a : b= c : d = e:i = 1:2 , then find (3a + 5c + 7e): (36 + 5d + i7).

If a ; b=c : d=e :f=1:2, t h e n (3a+5c+7e):(3b=5d+7f) 1:2 b. 1:4 c. 2:1 d. 8:7

If a/b=c/d=e/f=9/5 then (2a + 3c + 5e)/( 2b + 3d + 5f) = ?

If a/b = c/d = e/f = 2/5 , then (3a+4c+9e)/(3b+4d+9f) = _________ .

if (a)/(b)=(c)/(d)=(e)/(f)=(1)/(3) , then (5a+3c+7e)/(5b+3d+7f)= _________

vec a+vec b+vec c=vec 0,|vec a|=3,|vec b|=5,|vec c|=7 then the angle between vec a and vec b is (pi)/(6) b.(2 pi)/(3) c.(5 pi)/(3)d*(pi)/(3)