# I.- Sistemas con tres o más incógnitas

 951. 952. $x-y-z=1$ $4x-2y-z=5$ $2x-5y+10z=5$ $5x-3y+z=2$ $3x+2y-11z=10$ $2x-y+z=3$
 953. 954. $4x-3y+2z=8$ $\bg_black&space;2x-y+z=&space;12$ $5x+y-z=16$ $4y-3x-z=-18$ $6x-2y-3z=11$ $x-3y-4z=-20$
 955. 956. $x+y+z=0$ $4x-3y+2z=9$ $7x+2y-z=5$ $2x+5y-3z=4$ $3x+5y+4z=-2$ $5x+6y-2z=18$
 957. 958. $5x-6z+4u=15$ $2x+3y+4z=16$ $x-4z-3u=19$ $3x+2y-5z=8$ $2x-z+6u=46$ $5x-6y+3z=6$
 959. 960. $x+y-z=-10$ $2x+4y-3z=22$ $2x-3y+5z=23$ $4x-2y+5z=18$ $3x+2y+2z=11$ $6x+7y-z=63$
 961. 962. $x+y=11$ $x+y=10$ $x+z=101$ $x+z=19$ $y+z=110$ $y+z=23$
 963. 964. $3x+4z=20$ $2x-3t+2z=13$ $5x-2u=18$ $4u-2x=30$ $4z+9y=35$ $4t+2z=14$ $5t+3u=32$
 965. 966. $x+\frac{y}{2}=1$ $\frac{x}{2}+\frac{y}{3}+\frac{z}{4}=41$ $y+\frac{z}{3}=1$ $\frac{x}{3}+\frac{y}{4}+\frac{z}{5}=31$ $x+\frac{x}{4}=1$ $\frac{x}{4}+\frac{y}{5}+\frac{z}{6}=25$
 967. 968. $3x-2y=15$ $x+z+y+u=10$ $x+3u=8$ $2x+3z+5y-3u=24$ $2x-5u=5$ $3x+5z-2y+8u=31$ $3u+4z=7$ $5x-4z+3y+6u=20$
 969. $7x-2z+3u=17$ $4r-2z+t=11$ $5r-3x-2u=8$ $4t-3y+2t=9$ $3z+8u=33$
 970. $\frac{3y-1}{4}=\frac{6z}{5}-\frac{x}{2}+\frac{4}{5}$ $\frac{5x}{4}+\frac{4z}{3}=y+\frac{5}{6}$ $\frac{3x+1}{7}-\frac{z}{14}+\frac{1}{6}=\frac{2z}{21}+\frac{y}{3}$
 971. 972 $\frac{1}{x}+\frac{1}{y}=\frac{4}{3}$ $x+y=a$ $x+z=b$ $\frac{1}{y}+\frac{1}{z}=\frac{8}{15}$ $y+z=b$ $\frac{1}{x}+\frac{1}{z}=\frac{6}{5}$
 973. $\frac{1}{x}+\frac{1}{y}=a$ $\frac{1}{x}+\frac{1}{z}=b$ $\frac{1}{y}+\frac{1}{z}=c$

Soluciones