【1+1】
    293.93*9.47+2816.16*3.4+87.02*(9.5+19)+379.82*(5.5+19)-9.61*21.02-182.57*18.38-562.4*9.8-1194.88*3.65
    940.5+21.48+225=
    1.5×15×10
    0.03×（435.25+280.82）=
     (174.88+(314.72-174.88)/(20000-10000)*(17744.42-10000))
     (174.88+(314.72-174.88)/(20000-10000)*(17744.42-10000)
    1.1×1.25×25×（（8×2+2×11）×0.8×0.9）
    (174.88+(314.72-174.88)/(20000-10000)*(17744.42-10000))
    123123123+123123123
    (174.88+(314.72-174.88)/(20000-10000)*(12571.87-10000)
    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

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