arctan(-0.793)
    arctan1.401
    tan58.7
    arccos0.52
    （18*0.51%+0.5*1000/99*1000*34/1000/1000）*0.9*0.1
    （18*0.51%+0.5*1000/99*1000*34/1000/1000/1000）*0.9*0.1
    （18*0.51%+0.5+1000/99*1000*34/1000/1000/1000）*0.9*0.1
    1571.5/111.5
    10*70+88*8+93.5+74
    3.247022-tan(3.247022)
    2.5-tan(2.5)
    C(22,5)*0.2∧5*0.8∧17
    C(22,4)*0.2∧4*0.8∧18
    C(22,3)*0.2∧3*0.8∧19
    C(22,2)*0.2∧2*0.8∧20
    C(22,1)*0.2∧1*0.8∧21
    C(5,2)
    C(4,3)
    506.3/1200
    1÷9801

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