若2x+3y+4z=6,3x+2y+z=4,则x+y+z=
1个回答
2x+3y+4z=6 (1)
3x+2y+z=4 (2)
(1)+(2)可得:
2x+3y+4z+3x+2y+z=6+4
5x+5y+5z=10
x+y+z=2
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