解方程组x+y=z=1,x+3y+7z=-1,x+5y+8z=2

解方程组x：y：z=1：2：7 2x-y+3z=21 解方程组{X：y：z=1：2：7 {2X-y+3z=21 三元一次方程组x+y+z=1解三元一次方程组x+y+z=1x-y+z=3x+y-z=-1 解方程组解方程组｛y=2x-7｛x+y+z=1｛3x-z=4 解方程组x+2y-z=1 ,3x-3y+z=2,2x+3y+z=7和方程组x+y=-14,y+z=-7,x+z=19 解方程组x+y-z=0,2x+y+z=7,x-3y+z=8 解方程组 :X+Y-3Z=1 Y+Z-3X=2 Z+X-3Y=3 解方程组 x+y+z=2 x-2y+z=-1 x+2y+3z=-1 解方程组：x-2y+z=-1,x+y+z=2,x+2y+3z=-1 解三元一次方程组 x+y+z=1 x-y+z=3 x+y-z=-1 解方程组：3x+7y+z=31.5,4x+10y+z=42求 x+y+z 解三元一次方程组 x+y-z=11 y+z-x=3 z+x-y=1 解方程组:x:y:z=1:2:3;x+y+z=12,求,x,y,z的值 解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1 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)/ 方程组x+y=3 y+z=6 z+x=7的解 方程组{x-y=3 y-z=6 x+z=7 }的解是 解方程组：2x+3y+4z=20,x+y+z=7