87*Y+(Y-107.86)*81=15495
    3*(1+a)^6+6*(1+a)^5+9*(1+a)^4=1
    x²+6x+2=0
    1.25X∧3-x＝-2
    (x+1)^5*(x-2)=0
    (x+1)^5
    sinx=5
    sinx=520
    sinx=520
    100+(10*tan(x))^2=10/cos(x)
    200*cos(x)+(tan(x))^2*cos(x)=10
    200*cos(x)+(tan(x))^2*cos(x)=10
    x=399729.75+0.12*0.5*x+0.1%*0.5*x+551.32+（x-0.12*0.5*x-0.1%*0.5*x-551.32）*0.8*0.2
    x=399729.75+0.12*0.5*x+0.1%*0.5*x+551.32+（x-0.12*0.5*x+0.1%*0.5*x+551.32）*0.8*0.2
    x=399729.75+0.12×0.5×x+0.001×0.5×x+551.32+(x-0.12×0.5×x+0.001×0.5×x+551.32)×0.8×0.2
    3x9.6-3x÷4+4x=9.3
    3x[(9.6-3x)÷4]+4x=9.3
    3x[(9.6-3x)÷4]+4x=9.3
    10000/x+10000/(x+102*0.1)=20000/(134+99*0.1)
    2（4.64-x）+x=9

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