2×x^2×e^2x+4×e^2x×x^3+4lnx-2=0
    100*3/5+（100*3/5+6）-x=100-（x/3+2）
    x+1/x-1+2
    100=3/5+（3/5+6）+（1/3+2）-x
    （130-25）*4/7=x
    （130-25）*4/7=x
    （x-25）*3/7=（x-25-42）*5/7
    7*4/0.2X=30.8
    85*3*(x-1.5)+85*3*(x-43.5)+2*39*3*(x-22.5)=85*6*(400-3-x)
    6x-2/x=0
    6q²-48q=0
    6q²-48q-120=0
    30%=[0.2×2×(720÷X)×0.4]÷[1-0.2×2×(720÷X)×0.4]
    30%=[0.2×2×(720÷X)×0.4]÷[1-0.2×2×(720÷X)×0.4]
    30%=[0.2×2×(720÷X)×0.4]÷0.6
    x+x-1/1-2
    0.75x=0.62(x+5)
    0.62x+3.1=0.75x
    X÷(2400-X)=8%
    -1/12（x-8）（x-8）＋27/4＝-1/8（x-7）（x-7）＋8＋17/8

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