x:y:z=7:10:5 ①2x+3y=44 ②

(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z x/2=y/3=z/5 x+3y-z/x-3y+z ①5x-4y+4z=132x+7y-3z=193x+2y-z=18②y=2x-75x+3y+2z=23x-4z=4 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) x+2y+3z=23 y-z=5 x+2z=10 {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. {x+2y+3z=11,x-y+7z=10,x+3y+2z=2 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? 3x-y=-7,y+2z=2,2x-2z=-5 求x,y,z x/10=y/5=z/7 x+y+2z=29 求x y z x+y+z=0,3x-2y-2z=5,y-z=2x-7 3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5