1.04999*1.419024^3
    80+1000/1.08
    √3sin（45+60）
    !(3)
    （100.68-98.02）/100.02*100%
    sec30
    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=

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