sinxarcsinx
    50000（1+x）^7=59446
    5000*（1+x）（1+x）（1+x）（1+x）（1+x）（1+x）（1+x）=59446
    tanx/x
    9x²-16x+64=0
    -800a^2+160a=0.0048
    63X/1.02*0.4+64X/1.04*0.3+62X/1.01*0.3=5350
    0.408X+0.316952381X+0.298190476X=5350
    0.4X+0.304761905X+0.295238095X=5350
    4x=143
    5350X+6300-74463.37-(5350X+6300)/(1+9%)*3%*1.12-(5350X+6300)*0.05%-591.64-(5350X-5350X/(1+9%)*3%)*1.5%-91.9=0
    16.38X+6300-74463.37-(16.38X+6300)/(1+9%)*3%*1.12-(16.38X+6300)*0.05%-591.64-(16.38X-16.38X/(1+9%)*3%)*1.5%-91.9=0
    (11526m+3129.72*0.2+432/m+84.34)/(29.64m+12*0.2)+6*(56777.5m^2+32892m-28051.1*0.2*m+762.68*0.2^2-2592*0.2/m-9592.5*0.2-50942)/（29.64m+12*0.2）^2 = 0
    (11526m+3129.72*0.15+432/m+84.34)/(29.64m+12*0.15)+6*(56777.5m^2+32892m-28051.1*0.15*m+762.68*0.15^2-2592*0.15/m-9592.5*0.15-50942)/（29.64m+12*0.15）^2 = 0
    (11526m+3129.72*0.1+432/m+84.34)/(29.64m+12*0.1)+6*(56777.5m^2+32892m-28051.1*0.1*m+762.68*0.1^2-2592*0.1/m-9592.5*0.1-50942)/（29.64m+12*0.1）^2 = 0
    (11526m+3129.72*0+432/m+84.34)/(29.64m+12*0)+6*(56777.5m^2+32892m-28051.1*0*m+762.68*0^2-2592*0/m-9592.5*0-50942)/（29.64m+12*0）^2 = 0
    (11499m+3055.5*0+432/m+84.34)/(29.64m+12*0)+6*(57824.4m^2+33041.1m-28962.7*0*m+2057.24*0^2-2592*0/m-5632.52*0-48910)/（29.64m+12*0）^2 = 0
    (11499m+3055.5*0.2+432/m+84.34)/(29.64m+12*0.2)+6*(57824.4m^2+33041.1m-28962.7*0.2*m+2057.24*0.2^2-2592*0.2/m-5632.52*0.2-48910)/（29.64m+12*0.2）^2 = 0
    (11499m+3055.5*0.15+432/m+84.34)/(29.64m+12*0.15)+6*(57824.4m^2+33041.1m-28962.7*0.15*m+2057.24*0.15^2-2592*0.15/m-5632.52*0.15-48910)/（29.64m+12*0.15）^2 = 0
    (11499m+3055.5*0.1+432/m+84.34)/(29.64m+12*0.1)+6*(57824.4m^2+33041.1m-28962.7*0.1*m+2057.24*0.1^2-2592*0.1/m-5632.52*0.1-48910)/（29.64m+12*0.1）^2 = 0

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