X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z

问题描述:

X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z

因为X/10=Y/8=Z/9,所以设X=10K,则Y=8K,Z=9K
带入X+Y+Z/2Y-3Z=(10K+8K+9K)/(2*8K-3*9K)=27K/(-11K)=-27/11