(1/((1/2*39.5)/(1.13*0.8*2.8*10^7 )+1/(323900*9.62)))/2240000
    1/((1/2*39.5)/(1.13*0.8*2.8*10^7 )+1/(323900*9.62))
    0.01*10*0.6-9*1000000000*4.5/1000000*1/1000000/1.5/1.5-1/1000000*1.25*10000*0.8
    1/3-（1/5-1/8）
    tan(90)
    1/0.32
    12000 * 3 * 0.11
    1.128^12
    e^ln(2)
    3.1415923535897932384626^3.1415923535897932384626^3.1415923535897932384626^3.1415923535897932384626
    1/6 *1000000000+1/2*1000*1000+1/2*1000
    1/6 1000000000+1/2*1000*1000+1/2*1000
    -90-arctan(0.05*5)-arctan(0.2*5)
    20lg5
    !(7)-C(6,1)*!(6)+C(6,2)*!(5)-C(6,3)*!(4)+C(6,4)*!(3)-C(6,5)*!(2)+C(6,6)*!(1)
    !(8)-C(7,1)*!(7)+C(7,2)*!(6)-C(7,3)*!(5)+C(7,4)*!(4)-C(7,5)*!(3)+C(7,6)*!(2)-C(7,7)*1
    1/(7.9*sqrt0.016)
    2.5*3.14
    2+1.5*((1/sin54.7)-1)+2.5*((1/sin54.7)-1)^2
    e^6

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