arctan0.7+arctan0.35=
    8/（1+0.05）+100/（1+0.05）^5
    100/(1+7%)+100/(1+7%)^2+100/(1+7%)^3+100/(1+7%)^4+1000/(1+7%)^4
    35/(1+8%)+35/(1+8%)^2+35/(1+8%)^3+35/(1+8%)^4+35/(1+8%)^5+35/(1+8%)^6+35/(1+8%)^7+1000/(1+8%)^7
    （1000/214.55)^(1/20) -1
    （1000/214.55)^1/20 -1
    6+5
    e＾112.79
    840*0.3
    360*0.2
    5/0.5
    20/40%
    e3
    37+3/22
    44-22*(-1/3)-7
    44-22* (-3/1)-7
    73260.07+83859.97+92153.82+126584.91+128800.28-250000
    5×[(32 -26 )²+(32-19)²+(26-32)²+(26-19)²+(26-18)²+(26-17)²+(19-32)²+(19-26)²+(19-17)²+(19-14)²+(18-26)²+(18-17)²+(17-26)²+(17-19)²+(17-18)²+(17-14)²+(14-19)²+(14-17)²]
    5×[(32 -26 )²+(32-19)²+(26-32)²+(26-19)²+(26-18)²+(26-17)²+(19-32)²+(19-26)²+(19-17)²(19-14)²+(18-26)²+(18-17)²+(17-26)²+(17-19)²+(17-18)²+(17-14)²+(14-19)²+(14-17)²]
    5×[(32 -26 )²+(32-19)²+(26-32)²+(26-19)²+(26-18)²+(26-17)²+(19-32)²+(19-26)²+(19-17)²(19-14)²+(18-26)²+(18-17)²+(17-26)²+(17-19)²+(17-18)²+(17-14)²+(14-19)²+(14-17)²]

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