1000/(1-(1.01)^(30))
    1000/((1.01)^(30)-1)
    (1-(1+0.0556)^(-15))/0.0556
    100（x+1）^2=6480
    lg（0.02275）
    x^2+2x=15
    100×(x+1)^2=6480
    (x+1)^2=6480/100000000
    (x+1)^2=6480/100
    440000*5*（1/30000+1/43000）+4*440000/25000+440000/65000
    sin(2arcsin(t))
    16/25-4/7
    10/13-16/25
    (27/1300)^(1/2)
    0.769231^2*0,15^2+0.230769^2*0.04+2*0.769231*0.230769
    10/13
    (0.2^2-3/200)/(0.04+0.15^2-2*3/200)
    0.5*0.15*0.2
    0.04/(0.04+0.15^2)
    (4/7)^2*0.15^2+(3/7)^2*0.04+2*4/7*3/7*(-0.03)

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