75(1/7%-1/(7%*(1+7%)^19))+1000/(1+7%)^19
    75(1/9%-1/(9%*(1+9%)^20))+1000/(1+9%)^20
    2/5×2
    ㏑0.7
    ㏑0.69
    ㏑0.7
    0.5*(1.6+0.6)*0.5*2*500*2
    (12.616+13.186)*500/2
    10.5+0.28*4+0.32*1.5*2
    105*0.03*500
    0.2*500*5
    （500/15+1）*2=
    －2.3470*2
    61^2
    log(10,2)
    log(10,0.3)
    sqrt9=
    4.609594-（12-3*4.609594+2*cos4.609594）/(-3-2sin4.609594)
    3-（12-3*3+2*cos3）/(-3-2sin3)
    80÷1.07+80÷1.07^2+1080÷1.07^3

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