已知x,y,z为3个非负实数,且满足3x+2y+z=5,x+y-z=2,若s=2x+y-z求s的取值范围

已知x,y,z为3个非负实数,且满足3x+2y+z=5,x+y-z=2,若s=2x+y-z求s的取值范围 已知x、y、z是三个非负有理数,且满足3x+2y+z=5,x+2y-z=3,若s=2x+y-z,求s的取值范围 已知x,y,z是三个非负有理数,且满足3x+2y+z=5,x+y-z=2,若S=2x-y-z,求s的取值范围 已知x,y,z为非负数,且3x+2y+z=5,2x+y-3z=1.若S=3x-y-7z,试求S的取值范围 x,y,z为三个非负有理数,且满足3x+2y+z=5,x+y-z=2,若2x+y-z=s,则s的取值范围是什么? 已知是三个非负有理数,且满足3x+2y+z=5,x+y-z＝2,若s=2x=y-z,求s的取值范围． 若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围 已知X Y Z为非负有理数,且满足3X+2Y+Z=5,2X+Y-3Z=1,若S=3X+Y-7Z,求S的最大值和最小值 已知x,y,z为非负有理数,且满足3x+2y+z=5,2x+y-3z=1,若S=3x+y-7z,求S的最大值和最小值 已知实数 X小于等于Y小于等于Z,且满足:3Y+2Z=3+X,3Y+Z=4-3X,(1)求X的取值范围;(2)求X+Y+ 已知x,y,z均为实数,且满足:x+2y-z=6,x-y+2z=3.求x+y+z的最小值 已知x、y、z为三个非负有理数,且满足4x-3y-6z=3,x+2y-7z=8.若s=2x+y-z,试求s的最大值或最小