已知x：y:z=3:5:6,且2x-y+3z=38,求3x+y-2z的值

来源：学生作业帮助网编辑：作业帮时间：2024/04/28 03:18:32

已知x：y:z=3:5:6,且2x-y+3z=38,求3x+y-2z的值
已知x：y:z=3:5:6,且2x-y+3z=38,求3x+y-2z的值

已知x：y:z=3:5:6,且2x-y+3z=38,求3x+y-2z的值
令x：y:z=3:5:6＝K
则x=3k,y=5k,z=6k
2x-y+3z=38=6k-5k+18k
k=2
3x+y-2z=9k+5k-12k=2k=4

设x为3a，y为5a，z为6a，代入2x-y+3z=38中，得a=2，继而得出x=6，y=10，z=12，
3x+y-2z=3*6+10-2*12=4

设X=3n,Y=5n,Z=6n,带入2x-y+3z=38,得n=2，所以x=6,y=10,z=12;最后带入3x+y-2z=4

已知方程组{2x-3y+z=0 且x*y*z不等于0 求 x：y：z {3x-2y-6z=0 已知X+Y/2=Y+Z/3=Z+X/4,且2X+4Y+6Z=120,求X,Y,Z的值已知x+y/2=y+z/3=x+z/4 且2x+4y+6z=120,求x、y、z的值已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值. 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=? 已知x：y:z=3:5:6,且2x-y+3z=38,求3x+y-2z的值已知方程2x+2y+3z=6且x+3y+5z=10,求2z-x+y的值已知x:y:z=3:5:6,且2x-3y+3z+36,求3x+y-2z的值已知4X=5Y=6Z,且X+2Y+3Z=69,求X.Y.Z的值已知x:y:z=4:5:6,且x+2y+3z=64,求x、y、z的值已知x:y:z=4:5:6,且x+2y+3z=64,求x,y,z的值已知x:y:z=3:5:6,且2x-y++3y=38,求3x+y-2z的值已知方程组{4x-3y-6z=0 x+2y-7z=0 且z≠0,则（x+y+3z）÷（4x-y-5z）=?结果和思路! 已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值. 已知x:y:z=2:3:4且x+z-y=36求x+y+z的值已知x:y:z=2:3:4,且x+z-y=36.求x+y+z的值已知x:y:z=2:3:4,且x+y+z=18.求x、y、z的值.