2x-y=1,y=3z+1x=2,3y-x=5x+y=0,3x-y=5 xy=1 ,x+2y=31/x+1/y=1,x+y=1x=1,y=1是方程组

分式加减的几道题目求速度1 .(x+y)²/（x-z)(y-z) - (y+z)²/（x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y= 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 x+y+z=6 x+2y+3z=14 y+1=z 求X Y Z各代表什么数,使下列等式成立1、X+X+X=Y+Y；2、Y+Y+Y+Y=Z+Z+Z；3、X+Z+Y+Y=180 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z matlab解对数方程组[x,y,z]=solve('0.29744*x/(3+0.1*x+y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)))^2','0.79*x/(3+0.1*y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.1*y+z)))^2','1.25*x/(3+0.1*z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.*1y+z)*(3+z)/ 10X+Y+1/3Z=10Y+X 10X+Y+2/3Z=100X+Y {x-y+z=6,x+3y=-1,y+2z=3 X+Y+Z=352X=Y+51/3Y=1/2Z x:y=3:4 y:z=2:1 x+y+z=20 急! 已知X：Y=0.3：1/2,Y：Z=2：3,求X：Y：Z x;y=0.3;2分之1,y；z=2;3,求x;y;z {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1 x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2