2.36/1.08+2.71/1.08/1.08+2.99/8%/1.08/1.08
    0.8*0.2+1.2*0.3+1.5*0.5
    [（3%-7%）^2+(8%-7%)^2+(10%-7%)^2]/3
    √[（3%-7%）^2+(8%-7%)^2+(10%-7%)^2]/3
    （3%-7%）^2+(8%-7%)^2+(10%-7%)^2
    （-10%-6%）^2+(5%-6%)^2+(23%-6%)^2
    arctan3.881
    arctan3.881
    2999*1.08-3.2
    5*2
    -91.5*2
    arctan0.05
    (9-9÷9)×9-8÷4
    204*270*252*255
    168*868
    arctan3.91
    1+1
    [(1+4%/12)^12/3-1]
    (1000000-1)*9999999
    10000*9999-9999

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