x^2+y^2-z^2=0的图像怎么画?
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/12 13:57:45
由x+3y-5z=0得x=5z-3y代入2x-y-3z=0中,得10z-6y-y-3z=07z=7y∴y=z代入x=5z-3y中得x=5y-3y=2y∴x=2y于是x∶y∶z=2y∶y∶y=2∶1∶1
由x+y-z=0,2x-y+2z=0可得:z=-3xy=-4x则3x-2y+5z/5x-3y+2z=3x+8x-15x/5x+12x-6x=-4x/11x=-4/11
x/2=y/3=z/4=kx=2k,y=3k,z=4k2x+3y-4z/x+y+z=(4k+9k-16k)/(2k+3k+4k)=-1/3再问:确定?
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
哇,这个很复杂啊再问:你会吗?
将Z当成已知数,将X、y用Z来表示2x+3y-4z=03x+4y+5z=0整理得:2x+3y=4z3x+4y=-5z变成二元二次方程解之得:x=-31zy=22z代人x+y+z/x-y+z=2/13
2x+3y=4z(A式),3x+4y=-5z(B式)A*3-B*2:y=22zA*4-B*3:x=-31z(x+y+z)/(x-y+z)=(-31z+22z+z)/(-31z-22z+z)=2/13
因为:X+Y+Z=0得:Z+Y=-X------(1)X+Y=-Z------------(2)Z+Y=-X------------(3)X^3+X^2Z-XYZ+Y^2Z+Y^3=X^3+XZ(X+
x+4y+3z=3x-2y-5z=0则x+4y+3z=0①3x-2y-5z=0,则6x-4y-10z=0②①②两式相加,得7x-7z=0,所以x=z代入①,得z+4y+3z=0,所以y=-z所以x+2
本题不一定要算出x、y,也能解出.(1)2x+2y-4z=0(2)2x+4y+5z=0(2)-(1):2y+9z=0即2y=-9z(1)÷2可得:x+y=2z故x+y+z=3z则x-y+z=(x+y+
1/3再问:过程再答:4x-3y-6z=0(1)x+2y-7z=0(2)(2)×4-(1)得11y-22z=0即y=2z(3)(1)×2+(2)×3得11x-33z=0即x=3z(4)将(3)、(4)
|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+2y-z=0,7x-y-z=0两式相减,得:6x-3y=0,所以y=2x代入x+2y-z=0中,得:x+4x-z=0,那么z=5x那么(x+y+z)÷(2x-y-z)=(x+2x+5x)÷(2
2x-3y-z=0..(1)x-2y+z=0...(2)(1)+(2):3x-5y=03x=5yy=3/5x将y=3/5x代入(1)z=2x-3y=2x-3*3/5x=x/5x:y:z=x:3/5x:
4x-3y+z=0(1)x+2y-8z=0(2)(1)-(2)×4得-11y+33z=0∴y=3z把y=3z代入(2)得x=2z把x=2z,y=3z代入x+y-z/x-y+2z得原式=(2z+3z-z
x+2y-4z=0①2x+y-5z=0②①*2-②:y=z③③代入①:x=2zx:y:z=2:1:1
括号是什么意思?只有一半
x*x+y*y+2z*z-2x+4y+4z+7=0(x*x-2x+1)+(y*y+4y+4)+2(z*z+2z+1)=0(x-1)^2+(y+2)^2+2(z+1)^2=0x=1,y=-2,z=-1x
令a=x/2=y/3=z/4则x=2a,y=3a,z=4a所以原式=(2a+3a+4a)/(2a+3a-4a)=9a/a=9
2x+3y-4z=0,3x+4y+5z=0两式把z看作已知,可解得x=-31zy=22z(x+y-z)/(x-y+z)=(-31z+22z-z)/(-31z-22z+z)=5/26