若1/x+2/y+z/3=4,3/x+2/y+1/z=6.则1/x+1/y+1/z=

来源：学生作业帮编辑：神马作文网作业帮分类：综合作业时间：2024/11/19 03:05:15

题目里是3/z吧.
若1/x+2/y+3/z=4,3/x+2/y+1/z=6
则1/x+2/y+z/3 + 3/x+2/y+1/z
=4/x+4/y+4/z
=4(1/x+1/y+1/z)
= 4 + 6
则
1/x+1/y+1/z = 10/4 = 5/2

若x-2y+4z=1,x+3y-7z=0,则y:z=? 已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. 3道高数题,1,函数F(x,y,z)=(e^x) * y * (z^2) ,其中z=z(x,y)是由x+y+z+xyz= {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 x+y+z=2 4x+2y+z=4 2x+3y+z=1 x+2y=3 x+y+z=36 2x+y+z=15 2y=3z x-y=1 x+2y+z x-z=-1 2x+z-y=1 如果,根号x-3+| y-2 |+z^2=2z-1 求（x+z)^y x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=? (x-2y+z)/9=(2x+y+3z)/10=-(3x+2y-4z)/3=1 连等,求x,y,z, 2x+3y+z=1 x+y+z=-2 3x-2y-z=-4 求x、y、z 若1/x+2/y+z/3=4,3/x+2/y+1/z=6.则1/x+1/y+1/z= {5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-