Question

已知3分之x=4分之y=6分之z不等于0，求x-y+z分之x+y-z的值

Answer 1

设x/3=y/4=z/6=k
所以x=3k，y=4k，z=6k
原式=（3k-4k+6k）/（3k+4k-6k）=5k/k=5

Answer 2

3分之x=4分之y=6分之z不等于0
x/3 =y/4 = z/6 = k
x=3k , y=4k, z=6k

(x-y+z)分之(x+y-z)
=(x+y-z)/(x-y+z)
=(3+4-6)/(3-4+6)
=1/5