105×(-84)÷(-98)÷45
    48×57+76×88
    52×93-62×129
    19×84+98×55
    87×55-44×91
    92×73+69×69
    （111+105+105+98.5）/36=
    7.95*151/12.18=
    7.95*161/12.18=
    7.98*161/12.18=
    8.98*151/12.22=
    290.98/43842
    2.9098/43842
    2.9098/4.3842*10^4
    3.1986/4.3842
    1.1853/4.3842
    (-102/(0.227*((11.9*10^(-3)))^2 ))^2*((0.017*10^(-3)))^2
    (-102/((0.227)^2*11.9*10^(-3) ))^2*(0.034)^2
    (1/(0.227*11.9*10^(-3) ))^2*(9.3)^2
    sin(cos(tan(log(ln(7)))))

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