Question

解方程组：x+y+z=15,x:y:z=3:2:1

Answer 1

由x:y:z=3:2:1

令x=3t,y=2t,z=t

代入x+y+z=15,得：3t+2t+t=15,得：t=15/6=5/2

故x=3t=15/2

y=2t=5

z=t=5/2