C(42,4)
    C(42,6)
    C(7,1)
    C(49,7)
    C(42,20)
    C(42,5)
    2000*121%+500*242% 2000*121%+500*242%+500*120% 2000*121%+500*242%+500*240% (500*120%)/(2000*100%)
    2000*121%+500*242% 2000*121%+500*242%+500*120% 2000*121%+500*242%+500*240%
    2%×4000/12000+4%×（1-35%）×8000/12000
    3*20
    3-ln(3e)-2ln(3e/4)
    3-ln(3e)+ln(4/(3e))
    1/3*0.04
    (lg2)^2+lg2*lg50+lg25
    tan 629.90904127
    tan 629.9090413
    tan 629.9090414
    tan 629.909041
    tan 89.358839165
    tan 89.35883916

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