2x+3y-5z=0,2x-y-3z=-2,2x+2y-z=3三元一次方程
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2x+3y-5z=0,2x-y-3z=-2,2x+2y-z=3三元一次方程
2x+3y-5z=0,2x-y-3z=-2,2x+2y-z=3三元一次方程
2x+3y-5z=0,2x-y-3z=-2,2x+2y-z=3三元一次方程
2x+3y-5z=0,①
2x-y-3z=-2,②
2x+2y-z=3 ③
①-②:4y-2z=2 ④
③-②:3y+2z=5 ⑤
④+⑤:7y=7,得:y=1
代入④:z=2y-1=1
代入①:x=(5z-3y)/2=1
即解为x=1,y=1,z=1
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