sqrt(2690)
    sqrt(2700)
    0.25000*6+0.45833*6*6+0.25000*6*6*6+0.04167*6*6*6*6
    50/1+0.43+100/（1+0.43）^2+150/（1+0.43）^3-150=
    15+15e-6
    √56.1
    √1.12
    arctan(2/3)
    arctan4
    2^(114514−2)
    1^(114514−1)+1919810/1+1^999
    tan170
    -1-3
    (1+4.7%/12)^12-1
    (1+4.8%/4)^4-1
    (1+4.9%/2)^2-1
    (1+5%/1)^1-1
    17300/1.11+10200/1.11^2+13800/1.11^3+7600/1.11^4-37500
    5700/1.11+12900/1.11^2+16300/1.11^3+27500/1.11^4-37500
    arcsin0.87

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