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    4*【(20+a)(500-20a)】=3*【(20+a)*400】+16000
    4*【(20+a)(500-20a)】-16000=3*【(20+a)*400】
    4*【(20+a)(500-20a)-16000】=3*【(20+a)*400】
    (20+a)(500-20a)-16000=(20+a)*400
    (1-x)^2(-1.3817/(1.2852-0.2852x)^2+0.6086/(1-0.93212x)^2)-x^2(0.04131/(1-0.93212x)^2-1.07507/(1.2852-0.2852x)^2)=-0.0.08980
    sin(2x-4)/(x-2)
    (-2-x)*(2-x)*(1-x)-2*(-2-x)=0
    300/X=300/1.25X+3
    300/X+3=300/1.25X
    75X+3.75X^2=0
    ln(r/1-r)=3.817
    (1-x)^2(-1.3817/(1.2852-0.2852x)^2+0.6086/(1-0.93212x)^2)-x^2(0.04131/(1-0.93212x)^2-1.07507/(1.2852-0.2852x)^2)+0.1235
    sinx
    a×a=8
    2X^2-(X-1)^2=7
    x5+x-1=0
    1+x%=0.9{1+(x+15)%}
    sin(x-2)
    X*1.13*1.05=680
    90=arctan0.5x+arctan10x+arctan0.03x+arctan0.0047x

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