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.

$4x-3y+2z=8$		$\bg_black 2x-y+z= 12$
$5x+y-z=16$		$4y-3x-z=-18$
$6x-2y-3z=11$		$x-3y-4z=-20$


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.

	$\frac{1}{x}+\frac{1}{y}=a$

	$\frac{1}{x}+\frac{1}{z}=b$

	$\frac{1}{y}+\frac{1}{z}=c$