已知x+y=8,y+z=12,x+z=10,则x+y+z=?
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已知x+y=8,y+z=12,x+z=10,则x+y+z=?
已知x+y=8,y+z=12,x+z=10,则x+y+z=?
已知x+y=8,y+z=12,x+z=10,则x+y+z=?
解
x+y=8
y+z=12
x+z=10
将三个式子相加
2x+2y+2z=30
∴
x+y+z=15
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