来自蒋颜玮的问题
已知x+y+z=a,x+y+t=b,x+z+t=c,y+t+z=d,求x+y+t+z
已知x+y+z=a,x+y+t=b,x+z+t=c,y+t+z=d,求x+y+t+z
1回答
2020-03-30 19:49
已知x+y+z=a,x+y+t=b,x+z+t=c,y+t+z=d,求x+y+t+z
已知x+y+z=a,x+y+t=b,x+z+t=c,y+t+z=d,求x+y+t+z
x+y+z=a(1)
x+y+t=b(2)
x+z+t=c(3)
y+t+z=d(4)
(1)+(2)+(3)+(4)得:3x+3y+3t+3z=a+b+c+d
所以,x+y+t+z=(a+b+c+d)/3
.