解方程组:x+y=5,y+z=7,x+2z=10

解方程组2x+y-z=7 x+y+z =1 2x-y-z=5 解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3 解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3 x+z=y 7*x=y+z+2 x+y+z=14 解这个方程组、 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 解方程组 2x+y-z=2 x+2y=5 x-y+2z=-7 解三元一次方程组方程组 -x+2y+3z 2x-2y+5z=13 3x+2y+z=10 解三元一次方程组{x/7=y/10=z/5,2x+3y-2z=34 方程组2x+3y+4z=128 x/7=y/10=z/5的解是 解三元一次方程组{x/7=y/10=z/5,x+2y+3z=84 方程组x/7=y/10=z/5,x+2y+3z=84的解是? 如何解方程组(x+2y)(x+2z)=-16,(y+2z)(y+2x)=8,(z+2x)(z+2y)=-7