Mathematics
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    20*(lg25-lg(2.74)-lg(0.274)-lg(0.548))
    2+4%751.2
    1-e^(-0.8)×2.12
    (9.372-8.488)/8.488
    90-arctan0.98-arctan1.96
    1/2+(3^(1/2)/2)*(3.1416/60)
    1/2+(3^(1/2)/2)/(3.1416/60)
    (2*4.2+3*4.8+0.5*3.9+2*4.5+1*4.5+3*4+1*3.9+3*3.9+3*3.4+4*3.9+19*3.915)/(2+3+0.5+2+1+3+1+3+3+4+19)
    (2*4.2+3*4.8+0.5*3.9+2*4.5+1*4.5+3*4+1*3.9+3*3.9+3*3.4+4*3.9)/(2+3+0.5+2+1+3+1+3+3+4)
    150000*6.2-150000*6.2(1-0.0006)^360
    150000*6.2-150000*6.2*(1-0.0006)^300
    150000*6.2
    150000*6.2*(1-0.0006)
    150000*6.2*(1-0.0006)^30
    150000*6.2*(1-0.0006)^300
    (√3-1/2)^2-√12
    abs(-2)*2
    sqrt(499.0355692^2-494.403752^2)
    0.97×0.94
    sqrt(499.0355692^2-494.403751^2)

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