若2x+5y+4z=6,3x+y-7y=-4,则x+y-z等于多少
若2x+5y+4z=6,3x+y-7y=-4,则x+y-z等于多少
X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少?
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
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?
若3x+5y+6z=5,4x+2y+z=2,则x+y+z的值等于【】
若3x+5y+6z=5,4x+2y+z=2,则x+y+z的值等于( )
若x比y比Z=2比5比7 则 2x+2y+z分之3x+4y-2z等于?
若2x+5y+4z=0,3x+y-7z=0,则x+y-z的值等于( )
已知2x+5y+4z=15,7x+y+3z=14,求4x+y+z等于多少?
已知x+y=3,y+z=4,x+z=5,则x+y+z等于( )
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?