20lgk-20lg0.02=52
    20lgk-20lg0.002
    X-(X*0.0033)=979000
    e^（x+1）-x^3
    -2L^2+8L=0
    e^（x+1）-x^3
    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

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