fun1=@(x,y,z)log((x^2+y^2+z^2);g=triplequad(fun1,90,110,50,7

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fun1=@(x,y,z)log((x^2+y^2+z^2);g=triplequad(fun1,90,110,50,70,20,40)
Error using ==> mpowerInputs must be a scalar and a square matrix.
Error in ==> @(x,y,z)log(x^2+y^2+z^2)
Error in ==> quad at 77y = f(x,varargin{:});
Error in ==> triplequad>innerintegral at 69 Q(i) = quadf(intfcn,xmin,xmax,tol,trace,y(i),z,varargin{:});
Error in ==> dblquad>innerintegral at 80fcl = intfcn(xmin,y(1),varargin{:}); %evaluate only to get the class below
Error in ==> quad at 77y = f(x,varargin{:});
Error in ==> dblquad at 60Q = quadf(@innerintegral,ymin,ymax,tol,trace,intfcn,...
Error in ==> triplequad at 53Q = dblquad(@innerintegral,ymin,ymax,zmin,zmax,tol,quadf,intfcn,...

矩阵运算要在运算符前加点的.

试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) (x+y-z)^2-(x-y+z)^2=? x,y,z为实数且(y-z)^2+(x-y)^2+(z-x)^2=(y+z-2x)^2+(x+z-2y)^2+(x+y 分解因式:f(x,y,z)=x^2(y-z)+y^2(z-x)+z^2(x-y) x,y,z为实数且(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y- {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 x/2=y/3=z/5 x+3y-z/x-3y+z 已知 x,y,z都是正实数,且 x+y+z=xyz 证明 (y+x)/z+(y+z)/x+(z+x)/y≥2(1/x+1 int x,y,z; x=2; y=4; z=7; x=y-- 已知(x+y+z)^2=x^2+y^2+z^2,证明x(y+z)+y(z+x)+z(x+y)=0 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3