17350800=13800×X（550-0.5X）
    2x=4
    2x=4
    -2L^2+8L=0
    -2L+8L=0
    3Q^2-4Q=32
    3/8x+3/8x+200+（3/8x+200）×4/11=x
    （20（60-X）+300）（X-40）＝6080
    （20X+300）（X-40）＝6080
    1/6+1/7+1/12+1/2x=x
    3/10x-1/3x＝8
    45x²-112x-64=0
    45x²-112x-64=0
    300x=280+（159+1）x
    300x=280*（159+1）x
    （400+x）^2＝105^2+（400-x）^2
     1/6x+1/12x+1/7x+9=2x
    x=1/6+1/12+1/7+9
    x=5/6+6/7+11/12+9
    x=5/6x+6/7x+11/12x+9

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