1 已知想x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值2 小明和小刚一同解方程组ax+by=26,cx+y=6,小明得x=4,y=-2,小刚把c写错了得解x=7,y=3,求a,b,c的值

已知x,y,z满足 2倍(x-y的绝对值)+(2y的平方根)-z+(z×z)=-1/4,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 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X、Y、Z满足2X-Y+4Z=8(1);X-2Y-Z=7(2)求X-Y-Z的值 已知实数x,y,z满足2｜x-y｜+√2y+z+z2-z+1/4=0求x+y+z的值 已知整数x、y、z,满足x≤y＜z,且｜x+y｜+｜y+z｜+｜z+x｜=4,｜x-y｜+｜y-z｜+｜z-x｜=2,求x^2+y^2+z^2的值. 已知整数x,y,z满足x≤y＜z,且|x+y|+|y+z|+|z+x|=4 |x-y|+|y-z|+|z-x|=2 那么x²+y²+z²的值 已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0 已知正数x,y,z满足x+2y+3z=1,求最小值 已知实数x,y,z满足4x^2/1+4x^2=y,4y^2/1+4y^2=z,4z^2/1+4z^2=x,求x,y,z的值 已知x,y,z,t,满足方程组x+y+z=6,2x-z+t=-2,y+z+t=4,x-2y+t=-4,求想,x,y,z,t, 已知非负实数x,y,z满足x+y+z=3 (2),求证x^2/(1+x^4)+y^2/(1+y^4)+z^2/(1+z^4)≤1/(1+x)+1/(1+y)+1/(1+z) 已知x、y、z满足x+y+z=xyz,求证：x(1-y^2)(1-z^2)+y(1-x^2)(1-z^2)+z(1-x^2)(1-y^2)=4xyz 已知实数x,y,z满足x+y+z=2根号x-1+2根号y-1+2根号z-1求X+2Y+3Z 已知x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值.要2种方法 已知:X、Y、Z满足2X-Y+4Z=8,X-2Y-Z=7,求X-Y+Z的值 已知x.y.z满足x-2y+z=0且7x+4y-5z=0,求x:y:z的值 已知x、y、z满足x—2y+z=0 7x+4y—5z=0 ,求x：y：z