带入就行了,还是自己多做做题吧
2x-y=7 x+y+z=25x+3y+z=2 x-2y+z=-1 3x-4z=4 x+2y+3z=-1x+y-z=6x
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相关问题
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1:7x+2y-z=7 2:6x-y+z=7 3:4x+3y+z=9 1：9x+4y+z+10 2：-9X+2y+3z=
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x-5y-3z=0 y+z-3x=3 x+y+3z=14 y+4z=3 z+x-3y=5 2x+y+z=7 2x-z=1
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x-2y+z=-1 3x+4y-2z=7 2x+2y-3z=6
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2X+2Y+Z=4 X+4Y+3Z=6 X+3Y+2Z=7
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(1)2X+4Y+3Z=93X-2Y+5Z=115X-6Y+7Z=13(2)X:Y=3:2Y:Z=5:4X+Y+Z=66
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4x-y+z=25,6x-z+2y=22,x+3y+z=-2
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(1)3x+4y=15 2y-z=2 x+2z=9 (2) x+y+z=8 2x+3y-z=6 3x-y+z=8 (3)
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x+2z=3 x+y+z=2 2x+y=2 3x-y-4z=5 2y+z=7 2x+3y-2z=0
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2x+5y+4z=6,3x+y-7z=-4,4x+3y+12z=-2 求x+y+z
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2x+3y-z=4,3x-2y+3z=7,x+3y-2z=-1