已知x+2y+3z=21,3x+2y+z=19,求x+y+z的值.
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已知x+2y+3z=21,3x+2y+z=19,求x+y+z的值.已知x+2y+3z=21,3x+2y+z=19,求x+y+z的值.已知x+2y+3z=21,3x+2y+z=19,求x+y+z的值.x
已知x+2y+3z=21,3x+2y+z=19,求x+y+z的值.
已知x+2y+3z=21,3x+2y+z=19,求x+y+z的值.
已知x+2y+3z=21,3x+2y+z=19,求x+y+z的值.
x+2y+3z=21 (1)
3x+2y+z=19,(2)
(1)+(2)得4x+4y+4z=40
两边除以4得
x+y+z=10