Question

已知2分之X等于3分之Y等于0.5分之Z,则2X-Y+Z分之X+3Y-Z的值是

Answer 1

x/2=y/3=z/0.5=2z
x=4z, y=6z.
(x+3y-z)/(2x-y+z)=(4z+18z-z)/(8z-6z+z)=21z/3z=7.

Answer 2

设 2分之X等于3分之Y等于0.5分之Z=k
x=2k
y=3k
z=k/2
(x+3y-z)/(2x-y+z)
=(2k+9k-k/2)/(4k-3k+k/2)
=(21k/2)/(3k/2)
=7