2-2^0.98
    3-3^0.98
    0.98*ln300+0.02*ln200
    ln200
    440/50
    sqrt(128^2+160^2)/1.8
    tan30*tan60
    tan30*tan60
    -arctan0.006279917444
    (tanarccos0.84-tanarccos0.90)
    cos20
    log28十lg30 －lg3
    900*2.7
    sqrt5904
    60*60+48*48
    sqrt2304
    365：585
    35.5+23
    0.146*10
    169400：1210

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