x²－x＋1
    60/x-90/x=-3
    x:8=875%
    4:20=x/3
    0.2=4:x
    41.80x^2-114.32x-257.57=0
    41.80x^2-1134.32x-257.57=0
    -5.75x^2+176.67x-284.01=0
    18.27x^2-42.72x-269.73=0
    18.27x^2-55.23x-237.34=0
    -5.75x^2+122.85x-178.9=0
    -5.75x^2+122.85x+27.14=0
    1000/x=1600/(x+15)
    0.09*x＾2+0.63*x+0.4=0
    (1-x)²=0.65
    （4/3）=（5/6）x
    2*（2/3）=（5/6）x
    2:X=（5/6）:（2/3）
    （5/6）:（2/3）=（2/x）
    152x^2-391x+289=0

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