x-y-z=0 {x+y-3z=4 2x-5y+7z=21 三元一次方程解
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已知x:y:z=2:3:4,求(y+z-x):(2z+3x-4y)的值,又知x+y+z=7,求x,y,z.
x-y-z=0 {x+y-3z=4 2x-5y+7z=21 三元一次方程解
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3/2=4/y=5/z不等于0,那么X+y+z/x-y+z=?
若X Y Z 满足方程组 X-2Y+3Z=0 2X-3Y+4Z=0 则 X:Y:Z =?
x-y+z=6 x+y-z=0 2x-3y+8z=33
解方程:x+y+z=2,2x-y+z=-1,x+3y+4z=3
已知x/2=y/3=z/5,且3x+4z-2y=40,求x、y、z的值﹔详解
已知xyz都不为零,且方程组4x-3y-3z=0,x-3y+z=0求x:y:z
已知4x-5z=y-x+6z=x+y+z,xyz不等于0,求x:y:z
已知xyz≠0,且x+3y+z=0,2x+3y-z=0 ,求x+2y-7z /3x+5y+z的值?
若x,y,z满足方程租3x+7y-z=3 4x+10y-z=2 求x+y-z
已知x/3=y/4=z/5,求(3x+2y-5z)的值(3x+2y-5z)/x+y+z
若x+2y-4z=0 3x+y-z=0 求x:y:z
解方程(3x-y+2z=3,2x+y-3z=11,x+y+z=12).
解方程组:2x-y+z=6.-3x+2y-z=-9.x+y-2z=-1求解
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
X,Y,Z满足2X-Y的绝对值+根号Y+2Z+Z的平方-4Z+4=0,求(X-Y)的平方的值