20/21÷2
    1.5÷5
    6-9/2
    cos65
    sin65
    cos63
    sin63
    1.2^5*1.1^5
    12909^3+78^2
    1234909^3+78^2
    1234909^3+78^12
    123457909^3+78^12
    √0.000692
    {(-0.01575-0.0203875)^2+(0.0177-0.0203875)^2+(0.0585-0.0203875)^2+(0.0211-0.0203875)^2}/4
    sqrt(0.002767/4)
    （-0.01575-0.0203875）^2+（0.0177-0.0203875）^2+（0.0585-0.0203875）^2+（0.0211-0.0203875）^2
    sqrt｛（-0.01575-0.0203875）^2+（0.0177-0.0203875）^2+（0.0585-0.0203875）^2+（0.0211-0.0203875）^2｝
    lg2.5-1÷2.5
    lg2.5-0.4
    log(14,7)

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