90-arctan(0.05*10)
    8.26%*90000/(90000+2900)+6.3%*3132/(2900+90000)
    -51/92.0
    -0.69*4/11
    -0.2*51/92
    2.01-0.28+0.14
    -0.32*4/11
    (1.380662)^4/(6.626176)^3*8*4*3*2/(2.99792458)^3
    (1.380662*10^(-23))^4/(6.626176*10^(-34))^3*8*4*3*2/(2.99792458*10^8)^3
    1－e^2+1/1－e ^2－3≤0
    167960*0.7^11*0.3^9
    86493225*(0.48)^12*0.52^18
    593775*(0.72)^24*0.28^6+2035800*(0.72)^23*0.28^7+5852925*(0.72)^22*0.28^8+14307150*(0.72)^21*0.28^9
    20408163265306122448979591836734693877551*49
    155117520*0.28^15*0.72^15
    155117520*0.84^15*0.16^15
    533650325184459878135989793051885578200*0.84^15*0.16^15
    1-0.06537
    20*19*18*17*16*15*14*13*12/（9*8*7*6*5*4*3*2）*（0.7）^11*0.3^9
    0.114397+0.06537+0.030817+0.012007+0.003859

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