若x,y,z满足方程租3x+7y-z=3 4x+10y-z=2 求x+y-z
若x,y,z满足方程租3x+7y-z=3 4x+10y-z=2 求x+y-z
4x-3y-6z=0,x+2y-7z=0,xyz的积不等于0,求(x+y-z)/(x-y+2z)的值
已知x/2=y/3=z/5,且3x+4z-2y=40,求x、y、z的值﹔详解
x-y-z=0 {x+y-3z=4 2x-5y+7z=21 三元一次方程解
已知xyz≠0,且x+3y+z=0,2x+3y-z=0 ,求x+2y-7z /3x+5y+z的值?
已知xyz满足条件(x-2y-4)的平方+(2y+z)的平方+丨x-4y+z丨=0,求3x+y-Z
已知xyz都不为零,且方程组4x-3y-3z=0,x-3y+z=0求x:y:z
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
已知方程组{2x-y+z=3,3x+4y-z=8,x+y-2z=-3,
若2x+5y+4z=6,3x+y-7z=-4,那么x+y-z的值是多少?
若x+2y-4z=0 3x+y-z=0 求x:y:z
已知2/x=4/y=7/z,求(1)x:y:z(2)若2x+y+3z=58,分别求x,y,z的值.