由前两个式子,把y,z用x表示得
y=40-2x
z=x-10
所以 10
若x+y+z=30 3x+y-z=50 x,y,z均为非负数,M=5x+4y+2z,求其中M的取值范围
2个回答
相关问题
-
已知x+y+z=30,3x+y-z+50,x.y.z皆为非负数,求m=5x+4y+2z的取值范围.
-
若x+y+z=40,3x+y-z=60,x,y,z皆为非负数,且M=5x+4y+2z,求M的取值范围.
-
若x+y+z=30,3x+y-z=50,x,y,z均为非负数,且m=5x+4y+2z,试求m的最大值与最小值.
-
若x+y+z=30，3x+y-z=50，x，y，z都为非负实数，则M=5x+4y+2z的取值范围是______．
-
若x+y+z=30，3x+y-z=50，x，y，z都为非负实数，则M=5x+4y+2z的取值范围是______．
-
若x+y+z=30，3x+y-z=50，x，y，z都为非负实数，则M=5x+4y+2z的取值范围是______．
-
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
-
若x,y,z为正数,且3x+2y-z=4,2x-y+2z=6,求x+y+z的取值范围
-
已知x,y,z均为非负数,且满足x+y+z=30,3x+y-z=50 1.用含x的式子分别表示y和z,则y=（ ）,z=
-
已知非负数x,y,z满足3x+2y+z=5,x+y-z=2,若S=2x+y-z,求-S的最值