已知2x+5y+4z=15,7x+y+3z=14,求4x+y+z等于多少?
已知2x+5y+4z=15,7x+y+3z=14,求4x+y+z等于多少?
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少?
已知5/x=4/y=3/z,z不等于0.求:3x-2y/x+y+z等于多少?
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.
1.已知x:y:z=4:5:7,求:(一)2x+3y+z/5z; (二)x+y/y+z 非常急,
已知2x+5y+4z=15,7x+y+3z=14,求4x+2y+2z的值
已知2x+5y+4z=6.3x+y-7z=-4 求 x+2y+z
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.