解x+y+z=8;2x=y+5;1/3y=1/2z解这个三元一次方程式

解三元一次方程组1、x+y-z=4 2x-y+z=5 x-3y+z=-2 2、y+2z=-2 3x+y-4z=1 2x-y+2z=8 3、x-2y+z=-1 x+y+z=2x+2y+3z=-1 解三元一次方程 (1) x-2y=1 (2) x+y-z=11 x=3y y+z-x=5 x-3y+z=8 z+x-y=1 解三元一次方程 (1) x-2y=1 (2) x+y-z=11 x=3y y+z-x=5 x-3y+z=8 z+x-y=1..... 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? {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 {x+y+z=1 x-2y+3z=5 2x-3y-3z=-8 {x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2 x+y+z=-1 4x-2y+3z=5 y-z=8-2x x/(y+z)=1/8,z/(x+y)=1/5解得x/z=2/3 (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 x+y+z=1 x+3y+7z=-1 x+5y+8=2题错了 x+y+z=1 x+3y+7z=-1 x+5y+8z=2 解方程组 3x-2y=8 2y+3z=1 x+5y-z=-4 matlab解对数方程组[x,y,z]=solve('0.29744*x/(3+0.1*x+y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)))^2','0.79*x/(3+0.1*y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.1*y+z)))^2','1.25*x/(3+0.1*z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.*1y+z)*(3+z)/ x/2=y/3=z/5 x+3y-z/x-3y+z 解三元一次方程组 {2x+y+2z=1 y-2z=4 3x+y=9 {3x-5y=8 2x+3y-z=1 3x-5y=4