sec30
    50/51-48/49-1/49*2/52
    50*50-49*51-1
    50/51-49/50-1/50*1/51
    9/5×2=
    8/（1+0.05）+100/（1+0.05）^5
    90-arctan0.86*7.5-arctan7.5+arctan0.02*7.5
    ln(20)
     6800*（1+7.5%/4）^8-6800=
     6800*（1+7.5%/2）^4-6800=
    2800*（1+9%/12）^36=
    2800*（1+9%）^3=
    7000*{(1+12%)^0.5-1}
    7000*(1+12%)^0.5-7000=
    cos135
    cos45
    cos45
    73260.07+83859.97+92153.82+126584.91+128800.28-250000
    792-489
    1-2/5

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