2x-3y+5z与-3x+5y+z之和要加上多少才会等于5x-6y+4z?
2x-3y+5z与-3x+5y+z之和要加上多少才会等于5x-6y+4z?
X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少?
200分求数学题,急x+y-z=-14x-3y+2z=162x-2y-3z=5求z等于多少
x/2=y/3=z/5 x+3y-z/x-3y+z
c语言中负数的非等于多少?intx,y,z且x=3,y=-4,z=5求!(x>y)+(y!=z)或(x+y)与(y-z)
如果x/2=y/7=z/5,x,y,z都不等于0,则(x+y+z)/(3x-y)等于多少?
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6