0.1451sin(x)+0.21362cos(x)+3.57234*sin(x)*sin(x/2)-0.071207=0
    sin(x)+cos(x)=1
    sin（x）=0.5
    0.1451sin(x)+0.21362cos(x)+3.57234*sin(x)*sin(x/2)-0.071207=0
    0.276+0.4（1-x）=0.324+0.4x
    13.64％=x+(x-0.051)*1.25*0.79
    105=18x-x^2+(3x-13)/2
    105=18x-x^2+3x-13/2
    105=18x-x^2+3x-13/2
    105-18x-x^2+3x-13/2
    x∧x＋x＝68
    Cosxchx=-1
    8x²+2/X+5
    8x²+2/X+5
    e∧x=0.05
    -1000+100/(1+x)+200/((1+x)^2)+300/((1+x)^3)+400/((1+x)^4)+500/((1+x)^5)=0
    X+1070X/1870=37624
    （1+x）^5-1=2*x*(1+x)^5
    X+1070X/1870=30532
    13.24x²-26.48x+12.24=0

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