y=20(950-10x)-(5-x除以5)(950-10x)

问题描述:

y=20(950-10x)-(5-x除以5)(950-10x)

y=20(950-10x)-(5-x除以5)(950-10x)
=(950-10x)*(20-5+x/5)
=(950-10x)*(15+x/5)
=14250+40x-2x²