若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
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若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
3x+7y+z=5.(1)
4x+10y+z=3.(2)
(1)*3-(2)*2得
x+y+z=15-6=9
所以x+y+z=9
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3
已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值
已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
若x/2=y/3=z/4,则3x-2y+5z/x+y+z=
若4x=7y+5z,2x+y=z,则x:y:z的值为
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
x+y+2z=5 2x-y-z=4 3x+y-3z=10
X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21
3x+7y+4z=35,x+5y+2z=40,x+y+z=( )
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知3x+7y+z=315和4x+10y+z=420,求x+y+z