作函数图像：

y=(30x-40)/(-3.75)
y=(30x-40)/(-3.75)+(20-40x)/2.5
y=((33*sqrt17)2*(400+5*sqrt17)*x+560*(400+2*sqrt17-400x)+1600sqrt17+340-165x)/(-2079sqrt17/4)
y=(2-132/63)(400+5sqrt17)+(sqrt17-(33^2+31)/(63sqrt17))(400+2sqrt17-400x)-(1600sqrt17+340-165x)/(63/2*sqrt17)
y=(-sqrt17/126)(400+5sqrt17)+(4-(33^2+31)/(33/2*63sqrt17))(400+2sqrt17-400x)-(16/(33*63))(1600sqrt17+340-165x)

作函数图像：

y=(94sqrt17(400x+4sqrt17)+773.5(400(1-x)+2sqrt17)+(400x(6sqrt17-1)+24))/(-587.5sqrt17)+92
y=0.02(1600x+16sqrt17+400sqrt17(1-x)+34)-24.5/(587.5sqrt17)
y=0.68/sqrt17(400x+4sqrt17)+0.68(400(1-x)+2sqrt17)-6/587.5(400x-(6sqrt17-1)+24)

作函数图像：

y=(94sqrt17(400x+4sqrt17)+773.5(400(1-x)+2sqrt17)+(400x(6sqrt17-1)+24))/(-587.5sqrt17)+102
y=0.02(1600x+16sqrt17+400sqrt17(1-x)+34)-24.5/(587.5sqrt17)
y=0.68/sqrt17(400x+4sqrt17)+0.68(400(1-x)+2sqrt17)-6/587.5(400x-(6sqrt17-1)+24)

作函数图像：

y=(94sqrt17(400x+4sqrt17)+773.5(400(1-x)+2sqrt17)+(400x(6sqrt17-1)+24))/(-587.5sqrt17)+159
y=0.02(1600x+16sqrt17+400sqrt17(1-x)+34)-24.5/(587.5sqrt17)
y=0.68/sqrt17(400x+4sqrt17)+0.68(400(1-x)+2sqrt17)-6/587.5(400x-(6sqrt17-1)+24)

作函数图像：

y=(94sqrt17(400x+4sqrt17)+773.5(400(1-x)+2sqrt17)+(400x(6sqrt17-1)+24))/(-587.5sqrt17)+250
y=0.02(1600x+16sqrt17+400sqrt17(1-x)+34)-24.5/(587.5sqrt17)
y=0.68/sqrt17(400x+4sqrt17)+0.68(400(1-x)+2sqrt17)-6/587.5(400x-(6sqrt17-1)+24)