21×0.68×0.52=
    13.5×0.68×0.52=
    21×0.6×0.8=
    21×0.6×0.8=
    （7.95*1.13-9.99）÷9.99=
    （7.96*1.13-9.99）÷9.99=
    （7.95*1.13-9.99）÷9.99=
    （7.95*1.13-9.99）÷9.99=
    （7.95*1.13-9.99）9.99=
    （7.95*1.13-9.99）9.99=
    （7.96*1.13-9.99）9.99=
    39×0.6×0.8=
    50×0.69×0.5=
    12×0.68×0.5=
    35.6×0.69×0.5=
    35.6×0.68×0.5=
    (38.65×10^3)/(300×300)
    38.65/0.49
    300+2×200×tan45
    38.65/0.36

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