x×x+x=72
    e^(-2x+6)*cos(10x)+e^(-3x)*sin(2x)=exp(6)
    1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2+(1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2)*0.35+0.0524*X=x
    1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2+(1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2)*0.35+0.0524*X=x
    300x=954+3.1x
    300x=954+3.1
    x^2+6x+9=0
    900*2x=200+754
    900*2x=754
    2x=0.94
    x*x-200=754
    1625.6+1625.6*0.03+0.03*X+(1625.6+1625.6*0.03+0.03*X)*0.0475*2/2+(1625.6+1625.6*0.03+0.03*X+(1625.6+1625.6*0.03+0.03*X)*0.0475*2/2)*0.3+0.0524*X=X
    2.8x÷(3+x)=3.5x0.2
    5-5*e∧（-x）＝x
    10x=50000+5x
    （8500+95+X）*3.3%=4X
    1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2+(1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2)*0.2+0.0524*X=x
    1625.6+1625.6*0.03+0.03*X+(1625.6+1625.6*0.03+0.03*X)*0.0475*2/2+(1625.6+1625.6*0.03+0.03*X+(1625.6+1625.6*0.03+0.03*X)*0.0475*2/2)*0.2+0.0524*X=x
    1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2+(1460.5+1460.5*0.03+0.03*X+(1460.5+1460.5*0.03+0.03*X)*0.0475*2/2)*0.2+0.0524*X=x
    50000=（V-50)*1800-50000

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