80=10x(1-cos60)+x（1-cos30）
    80^2=7.68^2+x^2
    80=x(1-cos60)+10x(1-cos30）
    xx=4
    xx=4
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4+(-xx+4x-4)(-xx+4x-4)/16=(x-1)(x-1)
    (2-x)(2-x)/4=5
    √2x-x²=1÷3
    √2x-x²=1÷3
    √2x-x²=1÷3
    √2x-x²=⅓
    7200/x=10000/(0.7+x)
    1/(x+1)-(x+1)/(2x-2)=1
    4/x = 3/[√(9+x*x)-3]
    4/x=3/(√(9+x*x)-3)
    1083.334＝499.685+359.334+0.5*33.551x×x

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