cos(x/2) = 4.5×π×x/1809.54
    abs(x^2-1)=(4-2*3^0.5)*(x+2)
    31x∧2-62x＋30＝0
    cos(x/2)=4.5×π×x/1809.54
    cos(x/2)=0.007812x
    X2+53.46x+265.4=0
    X2-26.54X+265.4=0
    12.09×x=7.97×（3.5+x）
    12.09x=7.98×（3.5+x）
    x-（-33.5%）/-17.7%-x
    x-（-33.5%）/-17.7-x
    x=30-2*((x/2-2)^2)
    x=30-10*(0.2*(x/2-2)^2)
    x=30-10*(0.2*(x/2-2)^2+x/2000)
    x-1=3
    x(0. 05+x)÷(0. 35-x)=0. 625
    x^2-x+5=0
    x(0. 1+x)÷(0. 35-x)=0. 625
    x(0. 1-x)÷(0. 35-x)=0. 625
    15x^2-21x+35=0

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