3q²-40q+240=640
    6355.20X*0.2+31776.01*（1-X）*3.5=111216.03
    3q²+40q-400=0
    6355.20y*0.2+31776.01*（1-y）*3.5=111216.03
    31776.01X*0.2+31776.01*(1+X)*3.5=111216.03
    3q²-40q-400=0
    3q2-40q-400=0
    （20-a）*（720+6a）=11250
    640=240-40q+3q²
    40q+240+3q²=640
    xe^x-lnx-x=1
    1.5y/3=3.5y/2+1
    (2.5y-y)/3=(2.5y+y)/2+1
    4x=3x+4+12
    4x=3x+4x+12
    (2.5y-y)/3=(2.5y+y)/2+1
    3x²－10x+1＝－7
    x+33=√30*x
    x+33=√30*x
    -2260.08X=(1200-1299.546-32.2)

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