2x+4Y+8Z=100 x,y,z 各得多少
f为可微函数,z=f(x+y+z,xyz),z对x求导得多少,怎么求?
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
2x+y+z=4 x+2y+z=8 x +y+2z=24
x+y+z=51 4x+8y+5z=300 x+y+2z=67
求解2x≥x+y+z 4y≥x+y+Z 8z≥x+y+z x、y、z均大于0
已知X、Y、Z满足2X-Y+4Z=8(1);X-2Y-Z=7(2)求X-Y-Z的值
已知x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值.要2种方法
已知:X、Y、Z满足2X-Y+4Z=8,X-2Y-Z=7,求X-Y+Z的值
已知x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值.
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
1 已知想x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值
①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-