Mathematics
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    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.132607)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.253153)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.701583)
    (455-x)*12=50x
    (2x-1)/(3x+4)=3/5
    17(53-4x)-(33*3x+13x)=1
    (x-0.1)×100=200×(0.15-x)
    (x-10%)×100=200×(15%-x)
    2800乘(2+x乘x)=2800
    x*x*x*x*x-x*x*x=3
    5x-7*⅓等于0.9
    5x-7x⅓等于0.9
    20十2x=5x一44
    Tancos0.89-tancos0.91
    tanx=0.017211704
    1.01x=1213
    1.01x=1210
    X×0.7+20=94
    1.01x=1200
    5x-x²=6.25

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