f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)f=x+1, u=x+2, z=x+3, c=x+5, v=x+6, k=x+7, l=x+8求f(f,u,c,k)

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f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)f=x+1,u=x+2,z=x+3,c=x+5,v=x+6,k=x+7,l=x+8求f(f,u,c,k)f(x,y,z,w)=x

f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)f=x+1, u=x+2, z=x+3, c=x+5, v=x+6, k=x+7, l=x+8求f(f,u,c,k)
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)
f=x+1, u=x+2, z=x+3, c=x+5, v=x+6, k=x+7, l=x+8
求f(f,u,c,k)

f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)f=x+1, u=x+2, z=x+3, c=x+5, v=x+6, k=x+7, l=x+8求f(f,u,c,k)
f=x+1
f+u=2x+3
f+u+c=3x+8
f+u+c+k=4x+15
f(f,u,c,k) =(x+1)(2x+3)(3x+8)(4x+15)