x加y加z=40.x加y加z加z=50.x加y加y加z=60、x和y和z各是多少?
问题描述：
x加y加z=40.x加y加z加z=50.x加y加y加z=60、x和y和z各是多少?
答
x+y+2z-(x+y+z)=50-40
z=10
(x+2y+z)-(x+y+z)=60-40
y=20
x=40-20-10=10