若f(x,y)=xy,g(x,y,z)=x+y-z.求f(-1/3,1/2)-g(5,-3,4)的值
问题描述：
若f(x,y)=xy,g(x,y,z)=x+y-z.求f(-1/3,1/2)-g(5,-3,4)的值
答
就是按题意往里代数
f(x,y)=xy
f(-1/3,1/2)=-1/3*1/2=-1/6
g(x,y,z)=x+y-z
g(5,-3,4)=5-3-4=-2
f(-1/3,1/2)-g(5,-3,4)
=-1/6-(-2)
=2-1/6
=11/6