设函数f(x,y)=x2+y2-xytan(x/y),则f(tx,ty)=____.
t2f(x,y) 解析: 已知f(x,y)=x2+y2-xytan(x/y),则 f(tx,ty)=t2x2+t2y2-t2xytan(x/y)= t2f(x,y).
设函数f(x,y)=x2+y2-xytan(x/y),则f(tx,ty)=____.
t2f(x,y) 解析: 已知f(x,y)=x2+y2-xytan(x/y),则 f(tx,ty)=t2x2+t2y2-t2xytan(x/y)= t2f(x,y).