800+60x-2x^2＝1200
    160x-2x^2＝3150
    40x-2x^2＝3150
    x^4-9x^2+16=0
    121x^2+33x-154＝0
    3x^4+10x^3+21x^2+24x-16=0
    （x×0.0045）×36+x=94104
    （x×0.00383）+x=94104
    44x-2x^2＝192
    120m^2+10m-60=0
    5x^2+83x-126=0
    36x^2+31x-56=0
    36x^2+31x-5=0
    8x^2-58x+39=0
    60000/a=700
    6x^2+28x-98=0
    112 x^2+85x-143=0
    112 x2 +85x-143=0
    （60-50+x）（800-2x）=12000
    x［1200-5（x-120）］=157500

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