已知x² y² z²-2x 4y-6z 14=0,求(x-y-z)^2005的值
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X+Y-Z=6①Y+Z-X=2②Z+X-y=0③①+②+③得x+y+z=8④④-①得2z=2z=1④-②得2x=6x=3④-③得2y=8y=4即x=3y=4z=1
x+2y-z=6①x-y+2z=3②,①×2+②,得x+y=5,则y=5-x③,①+2×②,得x+z=4,则z=4-x④,把③④代入x2+y2+z2得,x2+(5-x)2+(4-x)2=3x2-18x
实数x,y,z,满足那么x+y=6,z^2=xy-9,∴xy=z^+9,(x-y)^=(x+y)^-4xy=-4z^>=0,∴z=0,(x+y)^z=6^0=1.
我怕来不及,等等发给你!再问:慢慢来,,,,,,再问:还没好??
假设x+y+zz=3x+2y-42x+2z=6+y===>y=2x+2z-6=2x-6+6x+4y-8=8x-14+4y===>3y=14-8xz=3x+2y-4===>3z=9x+6y-12=9x-
此题以初中的知识不大易解!应该是你题抄错了吧,根据这类题的常型,此题条件应该是x^2+y^2-6x+2y+|z+3|+10=0,得(x-3)^2+(y+1)^2+|z+3|=0,得x=3,y=-1,z
x+y-z=6y+z-x=2z+x-y=0三式相加得x+y+z=8-得2z=2z=1-得2x=6x=3-得2y=8y=4x=3y=4z=1
4x-y+3z=0(1)2x+y+6z=0(2)()+(2)6x+9z=06x=-9zz/x=-2/3(1)*2-(2)8x-2y-2x-y=06x-3y=06x=3yx/y=1/2z/x=-2/3x
设:x/4=y/5=z/6=k则有:x=4k,y=5k,z=6k(x+y+z)/(3x-2y+z)=(4k+5k+6k)/(12k-10k+6k)=15k/8k=15/8
x+2y-z=6,.(1)x-y+2z=3.(2)(1)-(2)y-z=1,y=1+z(1)+2(2)x+z=4,x=4-zx^2+y^2+z^2=(4-z)^2+(1+z)^2+z^2=3z^2-6
因为x:y:z=3:4:5所以设x=3k,y=4k,z=5k(k≠0)(1)z/(x+y)=5k/(3k+4k)=5k/7k=5/7(2)x+y+z=63k+4k+5k=612k=6k=1/2x=3k
|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0x-z-2=0,3x-6y-7=0,3y+3z-40=0x=11,y=13/3,z=9
因为|x-z-2|》=0,3x-6y-7)^2》=0,|3y+3z-4|》=0且|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0所以三个式子都等于0,得到一个方程组,解方程组得x=3,y
/>x/4=y/5=z/6=t分别用t表示x,y,z然后带入到要求的式子x+y+z/3x-2y+z中最终解得结果
解法1:2x+5y+4z=0式①3x+y-7z=0式②x+y-z=?式③式①=0,式②=0,所以式①-式③=式②-式③即:2x+5y+4z-x-y+z=3x+y-7z-x-y+zx+4y+5z=2x+
x+y-z=6标记为A,y+z-x=2标记为B,z+x-y=0标记为C,A+B:2Y=8Y=4A+C:2X=6X=3B+C:2Z=2Z=1然后就是结论.回答完毕.最完整的~
y=1+z,x=4-z,则x^2+y^2+z^2=3(z-1)^2+14,所以min=14再问:详细点,∈是什么意思再答:包含于,也就是属于的意思,即x,y,z都是实数,R是实数的意思吧再问:过程,y
x^2+y^2+z^2-2x+4y-6z+14=0x^2-2x+1+y^2+4y+4+z^2-6z+9=0(x-1)^2+(y+2)^2+(z-3)^2=0x=1,y=-2,z=3x+y-z=1-2-
X+Y-Z=6.aY+Z-X=2.bZ+X-Y=0.ca,b,c三式相加X+Y+Z=8.dd式-a式2Z=2Z=1d式-b式2X=6X=3d式-C式2Y=8Y=4
括号是什么意思?只有一半