5(x-1)(x－1)＋5－5(x－0.25)(x－0.25)＝1.25
    5(x-1)(x－1)＋5－5(x－0.25)＝1.25
    5x＝2
    sin1x/2
    sin1/2x
    sinx
    sinπx/2
    sin2x/π
    sinx
    X-188=（1-45%）x
    1380xx-1269600x+159500000=0
    1380xx-1269600+159500000=0
    1380xx-1269600x+145000000
    xx-920x+66667=0
    xx-920x+105872=0
    xx-920x+105072=0
    1303.93*(20+x)^-1.4+1.48*(x-20)=298.15
    x^2-6x-21=0
    1380xx-1269600x+145000000=0
    90=arctan0.5w+arctan0.05w-arctan0.23w

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