已知x+y=8,y+z=12,x+z=10,那么x+2y+z等于多少呢?
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已知x+y=8,y+z=12,x+z=10,那么x+2y+z等于多少呢?
已知x+y=8,y+z=12,x+z=10,那么x+2y+z等于多少呢?
已知x+y=8,y+z=12,x+z=10,那么x+2y+z等于多少呢?
x+y=8,
y+z=12,
x+z=10
用1+2 就等于 x+2y+z=8+12=20
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