Question

determinati numerele x y z stiind ca sunt direct proportionale cu 3 4 si 7 iar suma lor este 490 va roggggg dau coroana

Answer 1

{x, y, z} ~dp {3, 4, 7}

x+y+z=490

{x, y, z} ~dp {3, 4, 7} ==> x/3=y/4=z/7=(x+y+z)/(3+4+7)=(x+y+z)/14=490/14=35

Luam x/3=35 ==> x=105

y/4=35 ==> y=140

z/7=35 ==> z=245

Answer 2

Răspuns:

nr sunt direct proportionale=> x/3=y/4=z/7=K

=> x=3k

y=4k

z=7k

x+y+z=490

3k+4k+7k=490

14k=490

k=490/14

k=35

deci:

x=3×35=105

y=4×35=140

z=7×35=245