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)
    X+400-3/100*(20000+X/0.13)=1800
    -1200+（40*(1-X)*10-170）*5.6502+100*0.322=0
    x^3+5x-3= 0
    x^3+5x+6= 0
    x^3-5x+6= 0
    x^3-4x-6= 0

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