c^4+180c^3-125c^2-709380c-15574356=0
    （4X-28）÷8=5X-8
    b^4+180b^3-593b^2-793620b-15042186=0
    270x*x-9972x+82080
    x^3-3x-1＝0
    cos2x=-sin2x
    (y²-2*0.995y+0.995*0.995)*432＝0.995*y²
    x*tanx=2
    0.5x=1.25（18+x）
    106.289*（1-r）＝1+r
    100x=540+(20+5)x
    25x+54000-x=46000
    200x=2000+(160+78)x
    0.9*x-0.588*x^(1/2)=100
    0.9*x-0.288*x^(1/2)=100
    0.9*x-5.88*x^(1/2)=100
    0.9*x-2.88*x^(1/2)=100
    141.6*（1+r-2*0.995r）＝1+r
    log x=6.7
    0.992*（1+2*x）＝1

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