50/(tan159.8- tan10)
    tan159.8
    50/(tan(159.8)-tan(100))
    （300/27898）*299
    （550/27898）*299
    （750/27898）*299
    （3199/27898）*299
    （11699/27898）*299
    （3200/27898）*299=
    （300/27598）*298=
    （550/27598）*298=
    （750/27598）*298=
    （3199/27598）*298=
    （11699/27598）*298=
    （3200/27598）*298
    （3200/27598）*307
    -20*21+475+26250/21
    50*525
    (50-40)*(20+525/40)
    (50-21)*(20+525/21)

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