若X+Y+Z=30,3X+Y-Z=50,X,Y,Z均为非负数,求M=5X+4Y+2Z的取值范围.最后一步不懂
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若X+Y+Z=30,3X+Y-Z=50,X,Y,Z均为非负数,求M=5X+4Y+2Z的取值范围.最后一步不懂
若X+Y+Z=30,3X+Y-Z=50,X,Y,Z均为非负数,求M=5X+4Y+2Z的取值范围.
最后一步不懂
若X+Y+Z=30,3X+Y-Z=50,X,Y,Z均为非负数,求M=5X+4Y+2Z的取值范围.最后一步不懂
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=3y=2z,则x/x+y+z=?
(x+y-z)(x-y+z)=
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X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
若x+y+z=30,3x+y-z=50,x,y,z均为非负数若X+Y+Z=30,3X+Y-Z=50,X,Y,Z均为非负数,求M=5X+4Y+2Z的取值范围.很多人做出来都是120
已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=?
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
(y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值
x+y+z=30 3x+2y+z=50求详解
x/2=y/3=z/5 x+3y-z/x-3y+z
x+y/2=z+x/3=y+z/4 x+y+z=27