y=2x-7 5x+3y+2z=3 3x-4z=2

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/05 21:41:01

y=2x-7 (1)
5x+3y+2z=3 (2)
3x-4z=2 (3)
(1)代入(2)
5x+6x-21+2z=3
11x+2z=24 (4)
(3)+(4)×2
3x+22x=2+48
25x=50
所以
x=2
y=2x-7=-3
z=(3x-2)/4=1
再问：再问一题 x+2y-z=3 2x+y+z=5 3x+4+z=10
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再问：再问一题 x+2y-z=3 2x+y+z=5 3x+4+z=10 还有。。。。2x+4y+3z=9 3x-2y+5z=11 5x+7x=13 还有、、、。。x-y+2z/3=y-z+2x/7=z-x+2y/2=1 x/2=y/3 25%x+15%y=1.25 17x+7y=38 7x+23y=76 3x+4y/2=6x+5y/3=9 x+1/20=y+1/21=x+y/17 （x+y）/2-（x-y）/3=0 x+（x-y）/2+y=7
再答：采纳我，重新问
再问：重新问你？
再答：嗯先采纳，然后提问

x/2=y/3=z/5 x+3y-z/x-3y+z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=? {5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=- {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai