C(22,2)*0.2∧2*0.8∧20
    C(22,0)*0.2∧0*0.8∧22
    C(22,1)*0.2∧1*0.8∧21
    8+8*（8-8）/8
    8+8*（8-8）/8
    arctan10-arctan0.1
    arctan1-arctan0.01
    18240/(0.12%)×[1-1/(1+0.12%)^40 ]
    -arctan2-arctan0.4
    arctan10-arctan0.1
    -arctan0.1
    -arctan0.1
    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

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