Mathematics
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    10^1.7
    (20lg5)/20
    218.6+0.01748*(12571.87-10000)
    121.28+49+124.42
    5924.54×0.021
    1/10×24.75×7×7
    1.25×1.1×0.8×0.9×25
    tan(π
    2.67*20
    lg500
    246.4/22.4
    1621.67*9.65+4282.18*3.16+99.49*24+341.09*19.5-1.25(1544.43*14.07+1000.3*3.28)
    847.03*7.97+419.4*2.13-99.49*14.68-341.09*10.18-824.48*1.83
    13895+16434+16783+13986
    13895+16434
    0.39×12×83400/(5.3×5.3)
    (0.5+0.47)/(2+0.47)=
    (0.5+0.47)/(2+0.46)=
    0.47×12×83400/(5.35×5.35)
    (0.5+0.82)/(2+0.82)=

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