x+y+z=5
z=5-x-y
4x+3y+z=18
z
3x+y=11
3x+2y=13
3x+y=11 x+y+z=5 4x+3y+z=18
2个回答
相关问题
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已知x:y:z=3:4:5,3x+2y-4z=18.求：x+y+z.
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3x+3y3z=18 6z-5x+y=15 7z+x-9y=4
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3X-4Y-5Z=18 2X+y-6z=8 X+3Y+Z=22
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2x+3y+z=0 3x+y-4z=11 x+y+z=-3
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4x+4y+3z=9,3x-2y+5z=11,5x-6y+7z=13
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4x-3y-z=-11,2x+2y+z=11,-2x+5y-2z=6
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4X-5Y+2Z=1,8X-3Y-Z=15,5X+2Y-3Z=18
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{5x-4y+4z=13 {2x+7y-3z=19 {3x+2y-z=18
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3x-2y=5① y-5z=-11② 3z-4x=2③
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3x-2y=5① y-5z=-11② 3z-4x=2③